$-1\cdot\left(-13\right)$
$\frac{x^{4}-8x+15}{x^{2}-9}$
$\frac{9a^{-3}\:d^2}{5b^{-4}\:c^3}+\frac{x^{-4}\:y^3\:z^{-2}}{32}$
$2\left(3\right)-5\left(-7\right)$
$xy\:+\:y^2\left(\frac{dy}{dx}\right)=6x$
$2ab+3xy-9ab+2xy$
$\frac{x}{16}\cdot\frac{x-4}{4}$
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