$8n+8m^2+n-6m$
$\lim_{x\to0}\left(\frac{x^2}{2^x-1}\right)$
$1-45$
$3\left(-3k+5\right)$
$-19+20+200+100$
$100-12-\left(-7\right)$
$-4\cdot16$
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