$xdy=\left(2x+1\right)e^{-y}dx$
$\int_{-\infty}^1\frac{-1}{x^2}dx$
$2256-5124$
$5+\sqrt{x+1}=x+2$
$x^3\:\frac{dt}{dx\:}=\:ln\:x^2$
$-\left(9+1\right)-\left(7-5\right)$
$6x^2+7x+1$
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