$\lim_{n\to\infty}\left(\frac{-n\cdot e^{-\frac{s}{n}}}{s}+\frac{n}{s}\right)$
$\left(x+3\left(x+2\right)\right)$
$\left(m+4n\right)^3$
$\left(2x-4\right)\left(7x+7\right)$
$-1-2-\left(3-5\cdot2\right)+4$
$2x+7x-6x+8$
$-10x^4+\:5x\:^3+20x^2$
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