$4m^2\left(a-b^2\right)+6mn\left(a-b^2\right)+\left(-8am^3+8b^2m^3\right)$
$2x-5\ge3$
$-7+11-6+8-14-15-12$
$\left(2x\:+\:2\right)^3$
$\left|3-\left(-7\right)\right|$
$\left(x^2-3x-4\right)\left(2x^2-4x+5\right)$
$2-2+2-2$
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