3 , 9 - ? = 6, 2, ? + 8 = 10, 4, 5 + ? = 9, 2, 3 + ? = 5, 4, 7 + ? = 11, 10, ? + 4 = 14, 15, ? + 5 =20, 3, 3 + ? = 6, 7 , ? + 5 = 12, 60, 20 + ? = 80.

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