$x^2\left(x+6y-4y^2\right)+4y^2\left(x^2+\frac{3x}{2}+2y\right)$
$5\cdot18$
$\left(4y-5\right)\left(7y+4\right)$
$ax+ab-am$
$\left(5w+2\right)^4$
$\left(6k^5c\right)^4$
$-7n-7-8+10n$
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