How would I do this question below:

11. Solve and check for extraneous roots. Where necessary, round answers to 2 decimal places.

$\displaystyle 3^2x = 7(3^x)-12$

The 2x is the power of 3.

I have no idea how to even start that. I tried dividing it by 7 first. Didn't work. Then I tried bringing over the 12 and that didn't work either.