$-0.8x=-4.4$
$\frac{dy}{dx}=\frac{-3x}{5y}$
$18\cdot40$
$2\cdot x^2+32\cdot x+126>0$
$2yz+7y-2z-7$
$\frac{dy}{dx}=\frac{1}{2y}\cdot$
$9^0\:\cdot\:9^0\:$
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