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equivalent fractions of 3/21 = 6/42, 9/63, 12/84,...
1 over 3
7/21 = 1/3
3/7
3/4.
The lowest equivalent would be 3/8
3/5
1/7
It is: 3/7
3/4
2/3
35/21 is equivalent to 5/3, which can also be written as 1.666...
30/210 is one example.