10 - ? + 7 = 17, 2 - ? + 13 = 15, 5 - 14 + ? = 19, 0 - ? + 9 = 9, 14 - ? + 4 = 18, 4 - 7 + ? = 11, 11 - 1 + ? = 12, 3 - ? + 1 = 4, 12 - ? + 2 = 14, 6 - 10 + ? = 16, 8 - 7 + ? = 15, 1 - 7 + ? = 8, 13 - ? + 4 = 17, 7 - ? + 3 = 10, 17 - 3 + ? = 20,

Unknown Number - Adding to 20

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