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