$\frac{dy}{dx}+3xy=8x$
$x\frac{du}{dx}=\frac{x-2ux}{x}$
$5\left(-4\:+\:4x\right)$
$\frac{d}{dx}\:2x^2-3y^2=4$
$-4.5\cdot\left(-2\right)$
$\lim_{x\to2.1}\left(\frac{x-2}{x^2+3x-10}\right)$
$19-x=-19$
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