Easy math problem

Well, it doesn't look hard and I feel extremely retarded for not being able to figure it out but....HOW THE FUCK DO YOU SOLVE....

a^3 + (1/2)a = 9 ?!?!?!?!

easy; people always over-complicate this stuff:

a^3 + (1/2)a = 9
-a/2           -a/2
a^3 = 9-a/2 =
a^3 = (4.5-a)/2
*2    *2
2a^3 = 4.5 - a
-4.5   -4.5
2a^3 - 4.5 = -a
*-1          *-1
4.5 - 2a^3 = a
so a = 4.5 - 2a^3 which means a is probobly a little more than zero?