$r^2+8r+15$
$\int\left(x+3\right)\cdot\sqrt{x+7}dx$
$\left(7b\right)^2$
$4^2.25^2$
$9\left(2x\:-\:3\right)\:=\:7\left(x\:+\:4\right)$
$m^2+2m^2n+-mn+3m+6mn-3n$
$\int\left(8x-12\right)\left(4x^2-12x\right)^4dx$
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