$2x^2+1x-15$
$x^2+5x+7$
$\frac{6d^6}{3d^3}$
$a^2b^2+a^2b+ab^2$
$\int\left(\frac{2x}{x^2-4x+5}\right)dx$
$\left(-9a^2\right)\:-\:\left(-9c^2\right)$
$\left(b+10\right)\left(b-9\right)$
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