21, 42, 63 and so on.
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3, 6, 9, 12, 15, 18, 21 ...> 163059 etc
the common multiple is 18
6 12 18 24 30 36 42 48 54 60 66
3, 6, 9, 12, 15 and so on. 5, 10, 15, 20, 25 and so on. Common multiples include 15, 30, 45, 60, 75 and so on.
(21-21)+(21-21)+21 = 0+0+21 = 21