Answer
$ \frac{x+1}{x-1}$
Work Step by Step
$\frac{1+\frac{1}{x}}{1-\frac{1}{x}}=\frac{1+\frac{1}{x}}{1-\frac{1}{x}}\times\frac{x}{x}=\frac{x+1}{x-1}$
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