$m^4n^2-81$
$9\cdot04$
$\left(a+3\right)^3-9\left(a+3\right)\:$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{x+6}-3}\right)$
$64x^2-38x$
$\frac{3m^3}{m^2\cdot6m^{-4}}$
$v^2+7v$
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