$-3x^4-6x^2-9x$
$\int\frac{x^4}{1-x^2}dx$
$2z^{n+1}\left(3z^{n-2}\right)$
$2-10+2$
$\left(-3\right)+\left(-9\right)-\left(-4+11+6\right)$
$\left(a-2b\right)\left(-3b\right)$
$\frac{d}{dx}y^3-x^3\:+6\:=\:3y$
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