SOLUTION: What number can you add to and subtract from 129 such that the sum is twice the difference?

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Question 1109550: What number can you add to and subtract from 129 such that the sum
is twice the difference?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
.
129 + x = 2*(129-x)


129 + x = 2*129 - 2x


x + 2x = 2*129 - 129  ====>  3x = 129  ====>  x = 129%2F3 = 43.

Answer. 43.