5 - 15 + ? = 20, 2 - 6 + ? = 8, 4 - ? + 8 = 12, 3 - ? + 10 = 13, 10 - ? + 1 = 11, 0 - ? + 17 = 17, 13 - 1 + ? = 14, 17 - ? + 3 = 20, 1 - 12 + ? = 13, 16 - 3 + ? = 19, 7 - ? + 8 = 15, 9 - ? + 7 = 16, 8 - 4 + ? = 12, 15 - 2 + ? = 17, 6 - ? + 4 = 10,

Addition to 20 -Missing Number

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