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The answer is 7
2/7 = 12/42 5/6 = 35/42 12/42 + 35/42 = 47/42 or 1 and 5/42
35/42 + 36/42 = 71/42 = 1 and 29/42
18/35 + 13/42 = 1211/1470 or 173/210
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77 . . .