$-15\left(6z-12\right)$
$b^2+40b$
$x^2\frac{dy}{dx}-2xy=x^4+3$
$27a^6+343b^9$
$x^4+2x^3+x^2$
$9h^2-54h+81$
$2m^2d^2-6m^3-3d+d^3$
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