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28-12-2016
Mathematics

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solve 9x + 7 = 7x - 5

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Аноним Аноним

28-12-2016

9x + 7 = 7x - 5
9x - 9x + 7 = 7x -9x - 5
7 = -2x - 5
7 + 5 = -2x - 5 + 5
12 = -2x
12/-2 = -2x/-2
-6 = x

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