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This question already has an answer here:

I have to make a magic square using number 4-12.

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marked as duplicate by Gordon K, manshu, hexomino, Gamow, JonMark Perry Jun 10 '16 at 9:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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5 | 10 | 9
12| 8 | 4
7 | 6 | 11

The idea is:

Make the original square with numbers 1 to 9 and add 3 to every number.

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