$\lim_{x\to\infty}6-3x^3$
$2w-6-3w$
$\frac{1}{27}x^3-\frac{2}{3}x^2+4x-8$
$\frac{x^2\:+\:x\:-\:20}{x+1}$
$\int\frac{5x+7}{\left(x-1\right)\left(x+1\right)\left(x+2\right)}dx$
$3\sec b-6=0$
$\int\:\frac{\sqrt{x^2-16}}{3x}dx$
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