$7a^2b+21a^2+14b+42$
$81m^4\:n-3mn^4\:$
$\left(2^{-4}\right)^{-2}$
$-5\left(15+2\right)$
$\lim_{x\to1}\left(\frac{x^3+1}{x+1}\right)$
$\int\frac{ln}{x^2}dx$
$\int\left(7w+w^2+w^3\right)dw$
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