$\left(rs-12\right)\left(rs+7\right)$
$-5+\left(-3\right)\cdot\left(-2\right)-9$
$+c+9c-5c$
$\frac{x^2-4x-12}{x+3}$
$r2\:=\:100$
$\left(x\right)\cdot\left(-2x^2+1\right)$
$\left(-2a^2b\right)\left(ab\right)$
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