$3\cdot\left(m-2n\right)$
$\left(2x+15\right)\left(2x-15\right)$
$\:\int\frac{1}{\sqrt{25-x^2}}\:dx$
$\lim\:_{x\to\:\infty\:}\left(\frac{x^2-2x+3}{x-1}+ax+b\right)$
$\left(2x+7\right)\left(2x-3\right)$
$-15-28+2-80+50+-15+5$
$9a^2x^3+3ax$
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