SOLUTION: If 13 is added to a number and the sum is multiplies by 3, the result is 7 times the number decreased by 9. Find the number.

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Question 768522: If 13 is added to a number and the sum is multiplies by 3, the result is 7 times the number decreased by 9. Find the number.
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
3(13 + x) = 7x - 9
39 + 3x = 7x - 9
48 = 4x


x = 12