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

Subtraction - missing number

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