1 - ? + 11 = 12, 0 - 1 + ? = 1, 3 - 15 + ? = 18, 14 - ? + 5 = 19, 2 - ? + 1 = 3, 12 - 2 + ? = 14, 4 - ? + 5 = 9, 10 - ? + 6 = 16, 9 - ? + 3 = 12, 8 - ? + 3 = 11, 5 - ? + 8 = 13, 7 - 1 + ? = 8, 13 - ? + 5 = 18, 11 - ? + 6 = 17, 6 - ? + 10 = 16,

Addition with missing number

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