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

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