$\int_0^{\infty\:}\left(1-x\right)e^{\frac{x}{2}}\:dx$
$\left(3y-4\right)\left(2y+7\right)+11y-9$
$2a\left(3a-5b\right)$
$n+4\left(n+9\right)+20$
$3-7\left(5-6\right)\left(\left(-3\left(-2\right)+\left(-4\right)+8\:6\:\left(3\right)-2\right)\right)$
$9a^2-30a+35$
$40-\left(-2\right)$
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