
Tom Q. answered 01/31/13
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If you are trying to find n consecutive integers whose sum is x, and n is an odd number, then the middle number is x/n, and the other numbers go up and down by one each.
Specifically in this case, n is 3 and x is -63. Divide -63/3 and you get -21. So the three numbers are -22, -21, and -20. Add them up and you get -63.