$\frac{8}{x^{2-2x-15}}$
$\frac{dx}{dy}=\frac{xy+2y-x-2}{xy-3y+x-3}$
$5a+9b+3-2b-20a-13$
$-\int\frac{1}{x^2-4}dx$
$\frac{e}{26}\cdot26$
$\frac{\left(m\:3\:+2m\:2\:+4m+8\right)}{m-2}$
$a+a^2$
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