$-23ab^2+-20ab^2$
$\left(-3\right)\cdot\left(+5\right)-3\left(4+3\cdot\left(5-11\right)\right)$
$\int e^x\sqrt{1-9e^{2x}}dx$
$\lim_{x\to2}\left(6-x\right)$
$\int_{-2}^2\left(7x^{-4}\right)\:dx$
$17\left(40x^2+1027x+250\right)$
$12\:-\:\left[-8\:-\:\left(2\:-\:13\right)\right]\:$
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