$\left(-5x^2y^3\right)\left(3xy^{-2}\right)$
$\frac{5}{8}.\:\frac{5}{z}$
$3\left(n+8\right)+8\left(n+10\right)$
$-x^2+5x-2$
$7^8$
$\left(-4x+12y\right)^2$
$-4x^3+10x^2-6$
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