$9n+12n+7$
$\int\frac{2x^2}{5-ax^3}dx$
$\left(x^4-3\right)\left(x^4+7\right)$
$-4\left(2x+7\right)-10>-\left(3x+4\right)$
$2x^2-14x^2+34x+50$
$4x\:-\:9y\:+\:2z\:=\:5$
$\left(2x^2y^2-4x^2\right)^2$
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