$-3b\:\cdot7b^2$
$40m^9-40m^5-28m^3$
$\left(1+x\right)^n\left(1+\frac{1}{x}\right)^n$
$2m^2+24m+36$
$\left(8y+7z\right)\left(8y-7z\right)$
$\frac{4x}{\sqrt{5}}$
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