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8-9-2 = 19 , 12-7-4 = 23. 23 - 19 = 4, therefore we're looking for a third set that is 4 more in sum than the previous set (12-7-4) or 27.

21-4-x = 27, therefore x = 2

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Q: What is the missing number 8-9-2 12-7-4 21-4-x?
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