$\frac{2}{x-1}=\frac{x}{x+1}$
$\frac{dy}{dx}=\frac{e^{-y}}{e^xy}$
$\frac{dx}{dt}=-2$
$6x-9=2x+3$
$\frac{d}{dx}3xy+7x^2=2$
$2t\left(-x^2+5xy^4-2xy+y^5\right)$
$\lim\:_{x\to\:-2}\left(\frac{x^8+3x^2+2x}{x^2-x-6}\right)$
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