1, 9 - 8 = ?, 12, ? - 9 = 3, 2, 3 - 1 = ?, 4, 19 - ? = 15, 1, 15 - ? = 14, 13, ? - 4 = 9, 20, ? - 10 = 10, 8, 18 - 10 = ?

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