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6/7
18/21 in simplest form is 6/7.
39
21/54 = 7/18
18 over 21
21/5 is the simplest form.
The answer is 6/7
21/18 simplified would be 7/6
Yes, to 6/7
21/80 is already in its simplest form
21/18 = 7/6
18/42 = 9/21 = 3/7