7,14,9 / 3,3,2 / 6,5,?

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In the first and second group the middle number is 2 less than the sum of the two outside numbers, so 7+9-2=14, 3+2-2=3. Call the missing number x, so 6+x-2=5, making x=5+2-6=1. So one solution could be the missing number is 1.

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