$x^2-20x+19=0$
$\left(\frac{9}{10}\right)^{\infty}$
$\frac{dy}{dx}=-3y=2e^{3t}$
$4by+ax-2bx-2ay$
$\frac{d}{dx}e^{-x}\sqrt{x}$
$\frac{s^2+1}{s^2+5}$
$-x^2-7-30$
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