$\left(+8\right)\cdot\left(-7\right)\cdot\left(-3\right)$
$-2xy+4xy$
$\frac{-10}{u}=2$
$\frac{d}{dx}\left(\frac{x^2\left(x+5\right)}{\left(x-4\right)^4}\right)$
$\frac{d}{dx}\sqrt{xy}\:=\:4\:+\:x^2y$
$4-7\cdot9$
$\lim_{x\to-1}\left(\frac{x+2}{2x^2+5x+2}\right)$
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