$-12m+3n-3m-10n+5m-n$
$\lim_{x\to-2}\left|\frac{x}{x+2}\right|$
$\lim_{x\to\infty}\left(\frac{4x^2+3\cos\left(3x\right)}{2x^2-2\sin\left(2x\right)}\right)$
$\frac{x^2+3x+4}{2x+2}$
$x^3-2y;x=-1,y=2$
$3x+y=2$
$x^2-x-6\ge0$
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