There isn't really a pattern for the 7's, although there is one for the 9's. The 7's are pretty sporadic. they are one of those things you just need to memorize.
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the set of multiples for 7 is infinite
The multiples of 7 through 84 are 7,14,21,28,35,42,49,56,63,70,77 and 84.
The first 3 multiples of 7 are: 7, 14, and 21.
The least common multiples of 7 and 14 are 14,28 and 42>
Common multiples of 7 and 5 include 35, 70, 140, etc.