5 + 5 = 9 + ?, 1, 2, 3, 4, 5 + 5 = 3 + ?, 1, 5, 7, 8, 12 = 6 + ?, 4, 5, 6, 7, 17 = 8 + ?, 7, 9, 5, 4, 19 = ? + 10, 8, 9, 3, 5, ? + 7 = 13, 4, 5, 6, 7, 15 + 5 = 17 + ?, 3, 4, 5, 1, 15 + 5 = ? + 12, 7, 8, 9, 4, 20 + 20 = 30 + ?, 9, 10, 20, 15, 20 + 10 = 10 + ?, 20, 10, 15, 9.

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