$x2\:+\:18x\:+\:9\:=\:0\:$
$\left(x-2y\right)\frac{dy}{dx}+2x+y=0$
$\frac{dy}{dx}\:=\:x^2y^4$
$20+18+-15+-3+1$
$\sqrt{-625}$
$\frac{d}{dy}x^y$
$\left(5x-4\right)\left(\sqrt{x}+4\right)$
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