Simplifying $\frac{e^{nx} - 1}{e^{nx} - e^x}$ to be able to solve for x

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I am trying to solve the above formula for x, and having a hard time simplifying this formula any more than this:

$$\frac{e^{nx} - 1}{e^{nx} - e^x}-c=0$$

c and n in this case are known constants.

Any help would be very appreciated.