3 - ? + 9 = 12, 6 - ? + 10 = 16, 2 - 18 + ? = 20, 12 - 5 + ? = 17, 4 - ? + 2 = 6, 8 - ? + 7 = 15, 5 - ? + 9 = 14, 0 - ? + 1 = 1, 9 - ? + 1 = 10, 1 - ? + 2 = 3,

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