A Simple Equation that i cant solve

3^(2x-1) = 9^-x

Im having real problems with this equation i know its extremely simple but i cant find any information on the procedure to solve it. I know some basic laws of indices but this has both an X and a Y in it, whereas ive only got rules for an X.

Any help would be much appreciated
cheers
r52:confused:

Given:
3^(2x-1) = 9^(-x)

Solution:
3^(2x-1) = 3^(-2x) because 3^2 = 9
now 2x-1 = -2x
thefore x = 1/4

Regards
Shaunak

thanks for the help with that one! really appreciate it...