14/21
factor out 7
7*2/7*3
as factors you have the right to eliminate 7's top and bottom
2/3
--------simplest form
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7 over 11
21/35 = 3/5
6/7
21/30 = 7/10 in its lowest terms
21/24 in lowest terms is 7/8. Both the denominator and the numerator can be divided by 3.