$\frac{x}{-2}>\frac{1}{5}$
$2\left(6x+7\right)$
$\frac{36a^{-5}b^{-2}}{16a^{-6}b^{-4}}$
$\lim_{x\to20}\left(\frac{4x-20}{x-20}\right)$
$\frac{dy}{dx}+\frac{3y}{x}+2=3x$
$-\frac{4x^{10}y}{28x^5}$
$81x^2-\left(a-x\right)^2$
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