Answer
$\frac{1}{x}$
Work Step by Step
1. $1-\frac{1}{1-x}=\frac{-x}{1-x}=\frac{x}{x-1}$
2. $1-\frac{1}{1-\frac{1}{1-x}}=1-\frac{x-1}{x}=\frac{1}{x}$
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