$169y^2-25$
$4x^2-81y^2$
$\frac{2x-3x-36}{-12x}$
$\left(+47\right)\cdot\left(-36\right)$
$7^2-20$
$xy+3x^3y=x^3$
$\left(-4x^5yz^3\right)\left(-3xy\right)\left(x^6\right)$
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