$6+-3x+1+-1x$
$9m^2-25n^2$
$\frac{dy}{dx}=-2\left(2-x\right)y$
$x^2+8x-48$
$\frac{d}{dx}\frac{4}{x+2}$
$-45x^2+210x-225$
$4x^2+9x^4+16x^6=0$
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