$\lim_{x\to\infty}-\left(x+1\right)e^{-x}$
$\lim_{x\to0}\left(\frac{e^x+3x-1}{4x}\right)$
$x^2-4-117$
$\frac{\left(2xy-y-2x+1\right)}{x-1}dx+xdy=0$
$20-\left(15-8-6\right)+\left(5-7-4\right)$
$\left(m+3n^{x+1}z^n\right)^5$
$2\left(3-2x\right)<7$
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