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

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