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126, 252, 378
If that's 9, 14 and 21, the first three common multiples are 126, 252 and 378.
14, 28, 42.
14, 28 and 42
14, 28, and 42
42, 84, 126
14, 28, 42
7, 14, 21
70, 140, 210 and so on.
70, 140, 210