$\frac{21m^3+15mn-6m^2n^2+21}{3m+3}$
$\left(x+1\right)^2\left(x-2\right)\left(x+2\right)$
$3\frac{dy}{dx}=\left(2x+y-1\right)^2$
$lnx+ln\left(x-6\right)=1$
$2.31\cdot10^6$
$\left(3q+7\right)\left(3q-4\right)$
$\frac{dy}{dx}\left(1+x\right)\left(1+y\right)$
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