$-4v-6v+7v$
$x+12x+35$
$x^2\frac{dy}{dx}=2y+xy$
$\infty-17$
$\sec\left(y\right)-\left(\sec\left(y\right)\sin^2\left(y\right)\right)$
$\frac{2x-7}{x^{\frac{1}{2}}}$
$\left(z^a-w\right)\left(z^a+w^b\right)$
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