$\frac{x^2-x-2}{x+2}$
$-2\left(-7y+3\right)+5$
$\lim_{x\to0}\left(\frac{xe^x}{1-x}\right)$
$\int\:\frac{7x+3}{2x+1}dx$
$-x^2-2x$
$\int k\left(1-\frac{x}{2.5}\right)^{-7}dx$
$\left(-2xy\right)\cdot\left(4y\right)$
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