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13-06-2016
Mathematics

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Three times the sum of a number and seven is two less than five times the number.

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14-06-2016

3 (x + 7) = 5x - 2
3x + 21 = 5x - 2
3x - 5x = -2 - 21

-2x = -23
x = -23/-2
x = 23/2

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