$\frac{x^3y^{-2}}{z^2}$
$-3\cdot9\left(-9\right)$
$\left(x^2y+xy\right)\frac{dy}{dx}=y^2$
$ty'+y=t^2$
$-15-5x\le0$
$7\:15-\left(-3310\right)$
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