$\frac{\left(x^2+2x\right)\cdot\left(x^2-2x-3\right)}{\left(x+3\right)\cdot\left(x-1\right)}$
$\int st^2dx$
$\lim_{x\to\infty}\left(1+7x\right)^{\frac{3}{x}}$
$\frac{2+v}{2}-v$
$3a-4+2-a+5$
$\frac{1-n^6}{1+n^2}$
$\left(+5x^{2}+6x+7\right)+\left(-x^{2}-4x\right)$
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