$m2+30m+45$
$\left(a^{2n+1}\right)\left(a^{2n}-3\right)$
$x^2-4x-2y+5=0$
$225t^2-1$
$\left(-2x^3+7\right)\left(-2x^3-7\right)$
$x^{-5}\cdot x^1$
$2x\left(x-y\right)+4x\left(y-x\right)+x\left(2x-y\right)$
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