$x^2-4x+xy$
$\frac{2x^2-5x^2\:14x+10}{\:2x+3}$
$\frac{9}{x-2}=5-\frac{6}{x-2}$
$36m^6-39m^4-12m^2$
$m^2+2mn+n\:^2-1$
$\left(5x^3-4y^5\right)^3$
$-7\left(-4+2\right)+5-\left(-24\right)$
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