Infinite Geometric Series and the Geometric Series Test

If $$\frac{1} {x} + \frac{1} {2x^2} +\frac{1} {4x^3}+\frac{1}{8x^4}+\frac{1}{16x^5}+\cdots=\frac{1} {64},$$ and $x$ can be expressed in the form $\frac{m}{n}$, where $m,n$ are relatively prime positive integers, find $m+n$.

Source: 2011-2012 Winter Online Math Open