Hi guys!

I'm struggling with this problem, I'm sure that the solution is not too difficult, but I just can't figure it out.

6^{-2x}– 15 = 0. Now it is pretty easy to solve that equation the "regular" way and come to the answer of 540, but how do I solve it by using logarithm? If the exponential was positive that would also be easy, but it being negative is really screwing with me. Thanks for the help.