$10\left(9-x^3\right)^3$
$-28x^2-35x-7$
$y^4-3x^2-4=0$
$z^2-7z-30$
$\left(x^3\:+\:7x\:+\:7\right)\left(6+x^{-2}\right)$
$2m\:-\:4p\:+\:6m\:-\:8p$
$-9\left(5r-3\right)+9r$
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