$y''+6y'+9y=0$
$-2y^3+9y^3$
$\frac{dy}{dx}=10y$
$s^2+20s+\left(\frac{b}{2}\right)^2$
$\frac{3x^3-5x^3+4}{x+1}$
$\frac{dy}{dx}=\frac{1}{4y}$
$x^2-2x-5=0$
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