$\frac{dy}{dx}=2xy-4x$
$y^'=in\left(2x+7\right)$
$x^4-5\:x^2-50$
$[\left(500-3000\right)+2000]-500$
$4a^2\:-12ab\:+\:9b^2$
$-9\left[1+9\left(\:-4\:+9\right)\right]+15$
$x^2dx+\left(y-3\right)^2dy=0$
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