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21/18 simplified would be 7/6
6 over 7
18/21 in simplest form is 6/7.
The answer is 6/7
45/18 = 21/2
18 over 21
Yes, to 6/7
21/80 is already in its simplest form
21/22 is in simplest form.
13/21 is in its simplest form.
4/21 is in its simplest form.
21/52 is the simplest form.