$49m^2-42m$
$\frac{48xy}{xy}$
$13\cdot44$
$8\ln\left(e\right)^8-\ln\left(e\right)^5$
$-5x+9+5x$
$\frac{d}{dx}\:x^2\:+\:2y^2\:-\:3x\:-\:4y\:+\:2\:=\:0$
$\frac{5}{\frac{5}{6}}$
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