$\left(b-5\right)\left(b+4\right)$
$\left(2x^{-2}+3y^{-1}\right)\left(9y^{-2}-6x^{-2}y^{-1}+4x^{-4}\right)$
$-33+-1$
$3x^2+27x$
$\int\left(nx\right)^{\frac{l-n}{n}}dx$
$28\:\cdot\left(-15\right)\:$
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