$15a-3ab+4b-20$
$-0.2x^2+1.6x$
$\frac{dy}{dx}\left(xy+e^y=e\right)$
$\frac{x^2+7x-1}{x-1}$
$x^5+2x^4-16x-32$
$\frac{d}{dx}\frac{2x^2+4x-3}{x-5}$
$\left(x+2\right)^2\:+60\:=\:\left(x-2\right)^2\:-\:20$
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