You should be able to solve this.

x - 7 = 19 + x

A famous meme on /b/, well, I just solved it and want the credit.

x-x=26

(x^2)^0.5= a + and - number
For example. -3*-3=9, 3*3=9, therefore 9^0.5 = -3 and 3

+x--x=2x
x-x=26
2x=26
x=+13 and -13

x - 7 = 19 + x
x - 7 = x + 19

So you take a number and subtract seven.  That's equal to that same number plus nineteen!

So subtracting 7 and adding 19 are the same?  Only modular 26 can that have a hope of being true.

So x is anything modulo 26 (or 13 for that matter).

Q. E. D.

~Master's Student Anon with B. S. in Mathematics