$2p^2q+18p^2-4q+3q-7p^2-3pq+4p^2q$
$\left(3b+6\right)\left(3b-5\right)$
$\int\frac{x^2}{x^3-x^2-2x}dx$
$\log x+\log\left(x-1\right)=\log\left(4x\right)$
$x^2+6x+15>0$
$\frac{dy}{dx}=10-\frac{y}{4}$
$\left(xy^2-5z\right)^2$
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