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2014-08-04T16:24:26-03:00
-2 - (- \frac{1}{2} ) -  \frac{1}{8}
-2 +  \frac{1}{2}  \frac{1}{8}
 \frac{-16}{8}  \frac{4}{8}  \frac{1}{8}  \frac{-13}{8}
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