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$\displaystyle \displaystyle \frac{1}{h} \left[\frac{- 2xh - h^2}{x^2(x+h)^2}\right]$

$\displaystyle \displaystyle \frac{1}{h} \left[\frac{-h(2x+h)}{x^2(x+h)^2}\right]$

$\displaystyle \displaystyle \frac{-(2x+h)}{x^2(x+h)^2}$