$\lim_{x\to1}\left(\frac{x^2+x-2}{x^2-5x+4}\right)$
$\frac{-1^3-1}{-1^2}$
$7r\ge-98$
$4x-6=30$
$\left(\left(2+\sqrt{y}\right)\right)^2$
$\left(10^3\right)^6$
$12x^2-20x$
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