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

Addition With Missing "Parts"

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