$\frac{x^2}{9}-1$
$3\left(7-x^2-x\right)+x^2-3x-5-2\left(x^2+2\right)$
$81b^2-16$
$\left(2x^3-9y^4\right)^2$
$\left(3a-4\right)\left(4a-2\right)$
$27x^3-1$
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