$\frac{dy}{dx}=-y+\left(\frac{1}{1+e^x}\right)$
$100x^2-40x$
$14x+\frac{x}{5}$
$\frac{x^3-26x-41}{x+4}$
$y'+yx^2=-x^2$
$\lim_{x\to2}\left(x^2+3x+10\right)$
$\left(9-6a\right)^2$
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