$-2x^2-2x-1=0$
$x-3>-7$
$2=5$
$2x^2-24x+2y^2+12y+60$
$\frac{d}{dx}\left(\frac{e^{1-x}}{x^2-1}\right)$
$1+-5r-3r+9r$
$\frac{dy}{dx}=-y^2-y$
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