$\frac{x^2-2x-3}{x-2}$
$10a+20$
$\int\frac{3x+1}{\left(x+3\right)\left(x+n\right)}dx$
$\lim_{x\to\infty}\left(\frac{x^2-e^x+1}{x}\right)$
$\int\:\frac{x-3}{x-2}dx$
$\left(z+7\right)\left(z+8\right)$
$\left(8x+2\right)\left(6x-2\right)$
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