Answer
$\dfrac{2x}{x-2}$
Work Step by Step
The given expression, $
\dfrac{2}{1-\dfrac{2}{x}}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{2}{\dfrac{x-2}{x}}
\\\\=
2\div\dfrac{x-2}{x}
\\\\=
2\cdot\dfrac{x}{x-2}
\\\\=
\dfrac{2x}{x-2}
.\end{array}
