$\left(2mn^2+5n-mn^2\right)$
$2x^2-3x^2+7x^2-3x^2$
$1x^2+3x-1$
$r\:-\:10\:=\:-2\:$
$2y^4-6y^2-5y^2z+15z$
$4t-t+2$
$\int\frac{3}{2}\sqrt{3t+1}dx$
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