$81m^4-36m^2+4$
$2x\left(3x-1\right)^5$
$2x\:+\:1\:>\:\:-3x\:-\:2$
$\frac{x\left(x-1\right)}{3}-\frac{x-3x^2}{6}$
$x\left(8+9x\right)$
$w=2xy$
$\left(x+4\right)^2-\left(x-2\right)^2$
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