$m+71mn-14m-65mn+n-m-115m+6n$
$\frac{3}{x+5}-\frac{1}{x-2}$
$36x^3-210x^2+288x-96$
$\left(5x^8+8\right)^2$
$\frac{9a^2b^4}{3b}$
$12x^3\:-\:25x^2\:+\:12x$
$\int sec\left(\frac{1}{8}\right)xdx$
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