$4h^3-48h^2+143h$
$4b\:2\:x\:4b\:2\:$
$\left(9m^2-3n\right)^2$
$3x^2+5x-6x+4x^2+7x$
$-27+6\left(-9\right)+5$
$ac-cd$
$2x^2-4x-16$
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