$\int\frac{x^2}{\left(16+x^3\right)^2}dx$
$w^2+3w+4w-w$
$x+7\sqrt{x^2}-2x-65$
$\left(7y\right)\left(-7y\right)$
$\left(2x-4b\right)^7$
$\lim_{x\to0}\left(\frac{1+x}{1-x}\right)^{\frac{1}{x}}$
$3x+2y+9x$
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