$\left(21\right)\left(18\right)$
$\left(7x^{-4}+4x^{-3}+x\right)\left(2x^{-1}-8x\right)$
$144x^2-120x+5184$
$\left(-7a^2+7a-2\right)+\left(8a^2-2a-3\right)$
$4r+6r.$
$\int3x^2\sec^2\left(x^3+2\right)dx$
$\lim_{x\to-30}\left(g\right)x$
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