$3.26+5.22+42.1$
$2x-4a+5x-9a$
$y^2+16y-80$
$\left(-4\::\:2\right)\:+\left(-1+1\right)$
$\lim_{x\to0}\left(\sqrt{x}\cdot e^{-x}\right)$
$\left(x-2\right)\cdot\left(x+3\right)\cdot\left(x+5\right)$
$2x^3-x+1$
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