$\lim_{x\to\infty}\left(\frac{-x}{x^2+1}\right)$
$x+3>5$
$-31-\left(-44\right)$
$3x^4\left(4x^{\:3}-5x^2\right)$
$-3x\:-5y$
$x+5<5x-7$
$-3y+12x-y-3x$
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