$e^{-x}\frac{dy}{dx}=\left(1-y\right)^2$
$\frac{dy}{dx}\left(400+x\right)=-y$
$9t^2-6t-2$
$\sqrt{x^2}-2x$
$2x+1x$
$10^3\cdot10d^{15}$
$\sqrt{180}-\sqrt{80}$
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