$\frac{d}{dx}\left(50x^2e^{-x}\right)$
$1+x=-4$
$-1^2+4x-5$
$\int\frac{1}{\left(x-1\right)^2\left(x+4\right)}dx$
$\frac{x+1}{x^2-1}$
$-6x^2-3x+5=0$
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