$3m^2-mn+6mn-2n^2$
$1-8-\left(-9\right)$
$\lim_{x\to-2}\left(\frac{\sqrt{x^2-2x+1}-\sqrt{2x^2+1}}{x^2-4}\right)$
$\frac{z}{7}-6\ge-5$
$\lim_{x\to\infty}\left(\frac{\arctan\left(x\right)}{sinx}\right)$
$-\frac{15b}{2}-b$
$16-32+8-4-5-6-9+1$
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