$20+90+510$
$4\left(-3\right)+2\left(-1\right)\left(-3\right)-2\left(5\right)$
$\frac{dy}{dt}+2ty=t$
$p^7r^3\cdot3p^{-4}t^2r^{-3}$
$9-6\left(x-y\right)+\left(x+y\right)^2$
$\lim_{x\to9}\left(\frac{x\cdot\left(x+18\right)}{\sin\left(\pi x\right)}\right)$
$5x^2-125$
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