$\frac{7}{-\infty}$
$\lim_{x\to1}\left(\frac{x^3-x}{x^2-2x+1}\right)$
$2c^2-72c+648$
$7\left(y+3\right)\:-2y$
$\lim_{x\to-1}\left(\frac{2x^2-2}{x+1}\right)$
$-x+\left(-3x\right)+12-9$
$10+30c=\:-20$
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