$\displaystyle (2^x+9^x)/18^x $

I have to find the sum of this series from x=1 to infinity, which means that it is either a telescoping or a geometric series. I can't choose which because of its awkward format.

I know that it converges, but I don't what it converges to. Please don't give me the answer. I would just like a hint or a first step of what to do.

I've already tried this:

$\displaystyle (2^x+9^x)/18^x = (1/9)^x+(1/2)^x$