$3-\left[-2+11-\left(4-15-71\right)\right]-2+\left[-3-\left(5-26-1\right)+2\right]$
$\frac{dy}{dx}=x^{-1}$
$7z+8+3z$
$3^x-108+3^{x+1}=0$
$y'+4y=xe^{-4x}$
$1-9+6-1$
$\frac{dy}{dx}=\frac{xcos\left(x\right)}{1+y^2}$
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