$r^2-8r-48$
$x^3-2x^2=0$
$2x+4y=2$
$x^3+y^3-6=0$
$\frac{d}{dx}\frac{3x^2-x-2}{x-1}$
$x^2+4x-21\ge0$
$\lim_{x\to\infty}\left(9x\left(e^{\frac{2}{x}}-1\right)\right)$
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