$\frac{2x^2+x+2}{x+1}$
$\frac{x^{3-2x^2-4}}{x-3}$
$20+90+516$
$4x^2-2xy+y^2=\left(x+y\right)^2$
$\left(+20\right)\:+\:\left(-2\right)$
$5+3+2+7+\left(-5\right)$
$\frac{dy}{dx}+2xy=xy^4$
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