$2ab-3ab+7ab-8ba-2ba$
$14x^2+29x+15$
$\frac{2a^2b^2a^7}{\left(ba^4\right)^2}$
$\frac{2b+4}{2}+\frac{7b+9}{4}-\frac{b-12}{3}=30$
$\left(7-u\right)\left(7+u\right)$
$m^2+12+36$
$\left(9x^2y-7xy^2\right)^2$
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