$7x\frac{dy}{dx}+y=x^3$
$y=\:\frac{1}{2}\left(-x+3\right)$
$a^2+2a^2$
$\int w\sqrt{w-3}dw$
$y'\:+\:4y\:=\:3\:sen\:2x$
$\frac{d}{dx}3^{x^4+9}$
$\left(4+2x\right)^{-0.5}$
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