You can put this solution on YOUR website!
using common logs
log equiv of exponents
(x+2)log(12) = log(72)
x + 2 =
use your calc
x + 2 = 1.721
x = 1.721 - 2
x = -.279
:
:
Confirm with your calc enter 12^(-.279+2) ~ 72.0
-------- Convert to LOGARITHMIC form
That's ALL!! Nothing MORE, nothing LESS!!
It shouldn't take 1 hour, and UNORTHODOX or COMPLEX methods to solve this!