SOLUTION: Twice the differences between a number, x, and fifteen is three times the number

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Question 988136: Twice the differences between a number, x, and fifteen is three times the number
Answer by ikleyn(52747) About Me  (Show Source):
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Twice the differences between a number, x, and fifteen is three times the number.
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2*(x-15) = 3x.

2x - 30 = 3x,

3x - 2x = -30,

x = -30.