$-5\left[4+\left(5-7\right)\right]$
$\frac{20v^{9}}{\left(4v\right)^{2}}$
$\frac{2}{x+5}+\frac{x}{x-5}=\frac{-20}{x^2-25}$
$64k^2=-\:112k+\:49$
$\frac{d}{dx}cos\left(tan\:x\right)$
$33\cdot20\cdot48$
$2\int\frac{x}{e^x}dx$
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