trying to solve a math number puzzle with three lines of three using numbers 1-9

Rainbow

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Joined
Apr 19, 2013
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Need help solving number puzzles, the one i'm working on uses numbers 1-9 on three rows of three and all rows have to add up to the same number (including diaganol rows). I can work on it through trial and error, but want to know a faster way or formula to do it.
 
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