$a^2-a^2b-7a^2b+9ab^2$
$\frac{dy}{dx}=2t^2-3$
$z\:3\:+\:2\:z\:2\:+\:z\:$
$\sqrt{p^4}q^6r^5$
$z^{10}\left(-5\right)^2$
$\frac{4m^2n^2}{2mn^{-3}}$
$x^4+x^3-23x^2+31x+6$
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