$x^2+9x+16$
$3x^4\left(2x^2+2\right)$
$-7\cdot32$
$36x^{4m}-9y^6$
$4\cdot2\:+4\cdot3\:$
$5x^2\:-\:4xy\:+7y^2\:-\:\left(-6x^2\:+\:3xy\:-\:2y^2\right)\:$
$-5\left(-9z+2\right)+9$
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