$x^2+4x-165=0$
$\lim_{x\to0}\left(\frac{cos\:\left(x\right)}{1}\right)$
$\left(9x^{-2}+7\right)\left(9x^{-2}-7\right)$
$\lim_{x\to0}\left(\frac{2x-3^x}{x}\right)$
$\frac{x^7-128}{x-2}$
$\frac{a}{-7}-7=5$
$\frac{dy}{dx}=\frac{3x-5}{y-2}$
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