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21/-9x5+7(-9-11)x7.2=

 Jun 22, 2015
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$$\\21/-9\times 5+7(-9-11)\times 7.2\\\\
=\frac{21}{-9}\times 5+7\times(-20)\times 7.2\\\\
=\frac{21*5}{-9}+-140\times 7.2\\\\
=\frac{105}{-9}+-1008\\\\
=-11\frac{6}{9}-1008\\\\
=-11\frac{2}{3}-1008\\\\
=-1019\frac{2}{3}\\\\$$

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 Jun 22, 2015

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