$\left(2x^2-3\:\right)^2$
$-20x+3x-15x+2x-x+22x$
$-6<\frac{2x-3}{4}$
$1^{18}-9^2$
$\frac{14}{x^2-2x-48}$
$\lim_{x\to-1}\left(\frac{2x^2-8}{x^3+2x^2-x-2}\right)$
$\lim_{x\to0}\left(\frac{3-\left|x\right|}{3+x}\right)$
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