$\sqrt{xf^2+x}$
$\frac{-63}{3}$
$\left(2x\:+1\right)\left(2x\:-\:2\right)$
$-x^2+7x$
$15\cos\left(x\right)+2=7$
$x^3\left(5-x\right)^3$
$\left(x-13\right)\left(x-5\right)$
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