undefined, i think
\hspace{-16}$The Set of Real no.$\bf{x}$ for which $\bf{\frac{1}{x-2012}+\frac{1}{x-2013}+\frac{1}{x-2014}\geq 1}$ is \\\\ The Union of the form $\bf{a<x\leq b}$.\; Then What is the Length of Sum of\\\\ that Interval.
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