$3x^3+2x^3-x^3$
$\left(x+4\right)\left(x-4\right)+\left(5+x\right)\left(5-x\right)$
$-a^2-6a-9$
$x^6-2x+1$
$3x\left(x-4\right)+2\left(7x-1\right)+3$
$2x^2+12x+288$
$x^2+7x+81$
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