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18/7 is in its simplest form.
7/51 is in its simplest form.
14/30 in simplest form is 7/15.
7/15
1/4
1/7
18 over 14 in the simplest form = 9/7 or 12/7
18/21 in simplest form is 6/7.
It is simply 7 over 18, it can not be reduced further.
18 over 63 is 2/7
it is 7 over 18
7/18
2/7
6/7
The answer is 6/7