$4m+9m-12m-m$
$x^6-729y^6$
$\int\frac{3x+4}{x-2}dx$
$108:-18$
$\lim_{x\to2}\left(\frac{2x^2-5x+2}{x-2}\right)$
$\frac{dy}{du}=\left(1-u\right)\left(u+1\right)^2$
$\int\frac{x\:e^x}{3}dx$
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