Prefix Notation

I could do with some prefix notation practice (I have not reached Satori).

To this end, I'd be terribly obliged if you could post some nested mathematical expressions with nested brackets and only simple (+ - * /) operators, so I can practice converting them.

I'd also be obliged if you could tell me if I'm right/advise me where I'm going wrong.

An example;
7(8 x 9(10 x 3(8 + 4)))
(* 7 (* 8 (* 9 (* 10 (* 3 (+ 8 4 ) ) ) ) ) )

Am I right? Wrong? Advice?

(1-9+(7/1-(5+6*(2/(7/6+3)))-((5+6-4/4*((((1*6)-1*7-(3+((6*4)+(2/1/3)*7*8-1+(8*8+4))/4/5+1))/8/7)-9+(4*9*8)*8)/(5/4*((6/8/4)/(8+(6-1)/6+2*(4-6+((2*9)/(3-1/9+4/4)/(3+9/6-9)+7*5)-(1*(6*9*8/7+4)*6)-9))*9/(2-4)*7-(6-3/7-3*1)))-9)+4+(8/5+6+(3-9*(((7*8*3*4*(2*3+4+5+(7+4/8-8-5*6-7)-(6/4-8*4)))/2+7)+4+7/(9+4)-(1/(1/5*(6-7+5/5*4/8)/8/7)))+8-9/7)-(4+(1+4/(6-5)*4)/3-(((5*(7-(3+8/5)))/1-(2/3+2+3/((4+2+3)/7*(2*4)-3+(1/6-3)*3*(7+4*8/4*6+7))+(9+3-3-(2-5-1/1-1*5)-1*(1-3+4/2+5)))-1)-(2*((2+8-8*3-7)+2+6)-3-(((8+4-2-5-7)+(1-6-2*3))*(1+2)/((2/6*6)/3+2-8/(8*2/4-5)+(4-9*1*3))-3+1/(9/9/(3+3-8*2/3)/2))*(2/2*8-3+(2*2+(1*7/8/1+4*5)*5))+(5/5/4-5))-9-5-(1/(((5*9+4+3+8+5+9)/8+1-9+9+3)-((8/3+1-4*8+3)*2*9+6)+5+((5+4+6-6-9+9-7)+2*(8*5*5*7)*3+7+5))/2+9/(((4*7*8)*1)-3-7*(6/(1+9*2)+(1+8*5*4)*(2-4/3-8-7)/(4+7*8)-(1+5-6*9*3+7-9)))/1)+6*9)-(4-6+7+(8-((3-3+(1*1*3-8/7)/9)+8/((5*2*1-9/8*5)/6-5-2+(7+7/5*8*5*2+2)/(7*5/6-6)-(8*1+2/8)))*3+(4*6-6-(1-6/4-9-5))/6)+(((8+(3+9+8+7+9)-(5/1))-(8*1)-5)-(8/7)/(((8/7*3/3/7/1+9)/2+1/2*9)*6/6*(4-4-3-(1*3/8+6/4))/2*9))*4+2)*1*((2/5)*6/((7*8)/4)/1))+(4-((3+9+7/6)+(5+2*7+((6*8/4+(7*7-3*1/2/1/3)-(7*5/2+9*6+5+2))-8)/9*9-6)+6-8-1)+1-7-5*7))/9-8*6*(1*2/8+4*(9+(1*8+(4+7/9*(1*8+3*2/2-9)-3)+(8-7/6-6+(1/((1+9)-8/9-8*3-9)/((5/2)*(5/2)*6+(4/3)-4+6)-(6-1)+(3-4/7/2)-((6*2-4/6+9+3/5)/2)+7)/1)-1)*7/4-5*8)-(1/3*(6+((4/(2+6*3/1+(3+8-2/6*2*4+5)-3+4)-(2*5*6-9*1-5)/8)/4*9+(8/8*(9+(6*5)+9/(5+9-9*6/1/6*1)+(8*2+1-9+8)*6*2)-8*5+(1*(8/1-8*3-4+2/6)/(6*9/2*7-5-9*4)*9))-4-((9*5+1*(1*7+9/1)/3)+4/3-(9-5/(5-9)-(5-1)*9-(7-8-7-2)-8)/(5-(7-2/7))/4)*(9*(1+8*(2+9)*7/9)-((7*3+3/1/5-4/3)/3/1*7+7)/((2/4)+4/7*(3/8/9/4*5-3)-9+5*(6+5+2-5-6+4))*((2-3*2/9-2+9)-(9+4-5/5)*1)*4*8))+4+((((3*4)*6/6*5+5-6)/(5*(7*7+6+1*7*1)*7+2+(4+9+3-9))*(4+3*3+6+5+6)-(8*4*1+5-(5*1/9/7+5+7)/1)+((6+9/1-7*3+1*3)-4/(8/8/2-3*6*4)+6/5+8)*6-3)*(5-1+(1+2+5)/9)+(9-1+((6/5+6/1/3)+4-9+6+2/(4+8+1+9/5+8/5))))/8+((8/8/4+((1-6/8-1)/5/3))/3+8-8/9+1)+4)/9*(5/7)*5)))+(4-2-2-(4/7-7/2*(5*(((3-2)*8+2-9)+4-1*9*(2/6-8))/8*3)+2*(((7*6*(4*1*(4-6-(9/8+3*2-3*2+2))-7/(7/(3/8+4-3+1*8+4)-5))+(((3+6*5)*9+(3/5-3+1+7)+9/(7/3/9)-6)/9*(6+1-6)-((8+6+7/9*1*3)*2-(8-6-5-2+7)/6+(9*1/4+1/3))/1)/4+(1*(2/7/(2+8/6+4-8/6))/((2-1*9)/1-(2+5))/(1/(1-3*8)-8+(7+3)+1)-5))/(5-3+5+5)/(9*(5+9-(6-1-3)+8/4-7/6))*7-3+4+(7/5*6*8/4*((7*5+1+(7+9+9/5*8-5*2))+6+(7/8/8+(7+5/4+7)/5)+8)+(2-((4+6/5)-(6/7-9*5/2)*8)+2*4)))+3+6-(7*(2*9*2+7+((6+4-(2/5-7-1/1+5)/1/9-1)*7-8-(2-4*(7+3-1*6+6*8/2)+(5*1)+8/(8/4/9*3)-(5/3/1/1/9))/1-8))*(5/8+5*9)/4*5/5*2)/9*(8+2/6-((6-6/((9/3)+8-7+(2/4+8-8/2+5)-8-(9+1+7*4)))+(7+8/(3*2*6-(9+8*7)-8*(8+1/4-5)/1)+4))-1))))/5/9)/5+3*(2*3+(5+(1-9/3-3*8)+6/6)-(3/5/2-((((1/8+3/6+(((8*8/8/2-5/6)/(3/3*7*2*2/4)+4-9-5+3/6)*8*(6/9-2)))+6)*5)/2)*((5+4-8*(1/6/7/7-6+((1*4+9)+((6-6/3+8+6)*6-4+5+5+(6*(5*3+6-8+3-1/3)/7-(1-2+2*1-8-5)+9))-(2+6+(3+7+9)*8+(8-4-(8*9*6)/(2/1-2/2*3)/(7+9*9-6-6)-2)/5)+5+2/3*6))/2)/3*9/((3-7-9-(((5*6-8)+5/4-(2/(1-7+5)/(1*1+3*6/2*7-5)-5+(7+2+5)-9/1))*3)*5)+7-2*1)-(8-7*6-7/2/6))/4)*3*7))+8-(4/(7*2-((9-4)*(8+4*8/4)-1-(6-3-1))*4+4/6*(8*1+1-9+(1/1-3-6)))-(7+(9/(5-(5/((2*1)/6+1-4+5/6)/5+(1/8/5-8/2)-5*8)/8-(8+3)/7/(8*5-(4*((9-9-2/((5*4-4)*(2/9/7-3-6+9*9)+3)+((8-6-1)-7+6/1*(3+7+5*7*4+8+2)+7)+5)*3*(2*6-4-8/4-((7+9*2*2+5*2*3)*(4*2*1*6)/7+4-2-8/7))/(8*(1-8+2/6/9+8*4)-1+2-(4/(1-5)*8)+5*2)*(6/((7-9)/(9*7+8*8)*(9*9+2/6-5-9)*7/1+(3*5-4-6-2)*1)+(1/3-5*6)-6+7*(7/6-(2*6-9*4*2+2-1)*8/(6*8-2+1-8-8)))*(((7+1-5-9/3+9)/6-6+(2*3+1+5*5)/(2-9+8))/(2*(8*1)+(8/4-2*2-1-4)+(9-5*3*6*3/8/1)/5/6))))-((7-(4-((9*7+7*8/2/1-4)/2+5*(2+8/7*9-8)*3/8)/7*5/(3/(1*7-6/1/6))+5)+((9*3+3+3+9-(3/2+6*3/9))+9*(4+(2-3-3)-9*4+(4/9-7)+2-(9+4-6/3-5))-5-3)/4)/(1/9-3-2-1-2)*2)*5/6-6)))/6*5-1-9/8)-(7*8*(3*8-4/6+7*4-((((2-7+(9+2)/((5*1*(4/7-3+8+8)+(6+7*5-7)*7/2-2)/(6-6-(9+2)/(3-5*7-2-8))/((3+6+8*3)-(7+5*1-5-6)-4/5/(7-3*9*2+5)/1-(2/2))+(2*(6+3-1*4)*4-1-7-1)*(7+(1*2-6)-5*(7-3*4*7))/(5/3-(1+4)+(7/7*4-8/3*6)/1))*(9+2*3+(5+2)+5)*5-8)+9/4+9*(7*1*9*((6/(5*1*6)-5-2)-(7+3*2)/5-((2-4)*9/5+(7/2/9-3*2)-9/(8+9*5-5*7)-(4*4))-7-(6+5-1+(6/9+7*6+4+7/2))+(6+7))*(7-7+3/8/4+3)*4))*2/(3+((4-((3/6-7+2)-3+3*7))+9+7-1-1)/7*3))/6*3+8+(6*(8-8))*6*4))+(9-7)*5+4)*7+8)-(4+(6/6*5/9-5-(3*(((1+(4/7-((6/5-(6*7+8*3+1*6/2)*9*(5-9/4*2*7/1*7)+3+(9-7-9-3-4*1))/((5/5*8/8*3+9/4)/(7-6-7/1+1/9/9)-(7+3+3*3*4+7)*4+5)/9*8/(6/(8/8+6+2+9*5)))-(4*((2*5)-8*(1*9-1*3)-3/5-7)+8+((8/3*5/3)+2-3*3)*7/((2/5)-2-(1/7+1-7)*(3-6)+5*(2+5/5)*7)*1)*8+6-6)+8-3+2/1)+2+2/(1/(2+(3+1-2+((5+3+5+3*2*7+6)-4*3+(3+2/5+1)*4)*(2-3/(1-5-3*4/4+8-2)))/(4*5)+(8-3-4*5*9-(3-(6/2+3/9*3)+5)/(5+1*(6*3)-1*(3/6/6-6-8)))+(3*((3-8+3)+6/(9+4-2*8+5)+6-(3+3+3+1))*(5*2*9-1/(5/5/1*4)/(8-6)*7)/9)*1)+(2*2)+((((1+1-1)/5*(1*3+1-1/3-9)/5*(3/1*6-1*4+7/9))*1/8+7)+((4-4+5)+3*5-((3*6+6*5/6+3+7)+(1*3/2/6)+(9/1-2/9-8*9)-6-7-8*(9+6*7)))/5+4-(4/2+7-((9+9-4-5-5/2*3)/1*4-1+2)+8)*5*2)+(6/7)-3)/5)-(2*3*8+((1+5-2+3*3*((6-7-(7/6+9*6)+(2-3-2+3)*6/9*(2/4/4))/8/9+((5+3*8)-1*7*1/(3*1-8)+4-2)-((7+8)-(2/4-1*7/1*5))))-((8+7)/(5-(3-(3+8/4/9))+8-(5-3+1)*6)*5*4/2*4-2))-(((3+6-4/(1+2+(8/7*6-2-2)-9-8-6/9)/8-9/1)*(6+((6-9)-5*2-1+(8/8+6*7*2*8)/3)+((3-5*5/9/4/8+4)+9*(6*6)-7+7+5+9)/3*4*6)/2+4)-(((8+7/9+5+2-6)/((1/2)*(1*1+9-2-1*2+1)/5+(8-7-3/3*7/8*2)+5)*6/3-3+(2-(5+8+9*5/7)/(4/7)/4-3/(4/8*2)))*(6-((9-9-6/7/6-2)*2*3)-6)*5/(5/7+6*(1/2-(8*6-2/5)/(2/1/6+1*2/2)*3)/4))-5-(5*1*(((8+6/4)*7/8+4)*8+((6*7+2+9+4/1)-(4-6/5+1-6-9))*7-9-(6/3-3)*3)*8-(3-9/4+2)*6/4)/(2/4-2*(1-9+(4+6+(9*1+5+8)+3*8)-7)/9)*4)-7-(((((2-6+8-4*8*2*3)/(9-4*6-6/4*6-8)-(2+4+8-2+9+2+8)/7-2/(7-4))/3+2*(4+(5-6)+9+6))*6-3)*3+6))*8)-8-(2-4-9/(7+8*(9-8+(9+3+2-9*(1+8*5*4/9)/9*4)+7/((7-7)-((5/8)-2-2/(2-4-3+8-3/9))-(9*9/(8/(6/4-2/6))+7/((3*5+2)+8+(5+7)*(9-3-4-4+3+7*6))))))-6/5/4)/1*7+9)-(6-(3*6)/2*7))*1-1/(9/4+9-7/3/3))