Answer
$-\frac{1}{x+2}$
Work Step by Step
We can remove a factor of : $\frac{x-2}{x-2}=1$
$\frac{2-x}{x^2-4}=-\frac{x-2}{x^2-4}=-\frac{x-2}{(x+2)(x-2)}=-\frac{1}{x+2}$
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