$a^3-3a^2+5ab^2$
$x^2+18x+2$
$14x^2y-21xy2$
$\left(a^5+7\right)\left(a^2-3\right)$
$5\left(n+2\right)+8n+1$
$-12x-\left(-6-7x\right)$
$\left(6a^3+2b^5\right)^3$
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