21 can be divided by 7 but 18 cant
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18/21 = 6/7
The LCM of 21 and 18 is 126.
The highest common factor of 21 and 18 is 3
The Least Common Multiple of 18 and 21 is 126.
There are an infinite amount of answers to that, like: 21 - 3 = 18 1004 - 986 = 18 47 - 29 = 18