8 + ? = 12, 4, 6, 20, 1, ? + 7 = 13, 5, 21, 6, 9, 9 = ? + 5, 7, 8, 9, 4, 9 + ? = 15, 5, 6, 7, 2, 11 + ? = 18, 2, 3, 4, 7, ? + 4 = 9, 5, 12, 8, 7, ? + 5 = 7, 10, 11, 2, 17, 5 + ? = 10, 4, 5, 6, 8, 5 + ? = 11, 5, 6, 7, 3, 7 + ? =15, 8, 6, 7, 11, 5 + ? = 13, 5, 8, 7, 15, 7 + ? = 14, 5, 7, 3, 11, ? + 5 = 14, 9, 11, 6, 12, ? + 3 = 10, 5, 8, 13, 7, 8 + ? = 16, 7, 8, 9, 10

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