$x^2\frac{dy}{dx}=\sqrt{y}\left(9x+3\right)$
$\frac{1}{x}\frac{dy}{dx}=-ye^{x^2}+2e^{x^2}$
$yx-x^2-2x^3=0$
$\frac{d}{dx}\frac{1}{2x}+2x$
$\lim_{x\to\infty}\left(\frac{\sqrt{2}^x}{x^3}\right)$
$5a\:+\:10b\:+\:20c\:=\:5\left(a\:+\:2b\:+\:4c\right)$
$75\cdot15$
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