$x^2-3x-15$
$\left(x\right)\cdot\left(-2x^2+1\right)$
$-21-\:15g$
$x+3x^2y-3x^3y^2$
$\int\frac{z}{2z^2+8}dz$
$12:\left(-6\right)+4\cdot\left(-2\right)-1$
$6x+144x^2+144$
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