Since 14 is not divisible by the factors of 9 (9 and 3) 9/14 is in its simplest form. Dividing by 1 would not help because you would not make any progress.
9/14 is already in its simplest form
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18 over 14 in the simplest form = 9/7 or 12/7
9/14
14/18 = 7/9
9/14 is in its simplest form.
It is: 14/63 = 2/9