$\left(a^2+ab-b^2\right)\left(a-b\right)$
$\left(4a^3-5b^2\right)\left(4a^2+5b^2\right)$
$\frac{-90}{6}$
$6v+3v$
$-\left(x+3\right)=2x-6$
$\left(121-66d+36d^2\right)\left(11+6d\right)$
$-2x-5<15$
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