$a^2-a-72$
$\:-\:\left(-\:12+8-3+\:6\right)\:\:\:$
$\left(5n-5\right)\left(2-2n\right)$
$x^2+9x+18>0$
$2am^2-an^2+a^2mn$
$546-78$
$2a+3b-a+5b$
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