$a+4=8$
$\frac{x^2-3x+2}{x^2+2x+6}$
$xy\frac{dy}{dx}-y-2=0$
$xy^1-4y=x^{-3}e^x$
$4-2x<3x-1$
$\frac{4x^2+23x+33}{x+4}$
$y\left(4-x\right)dx+\left(x-2\right)dy=0$
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