There are an infinite number of fractions equivalent to 12/14, including 6/7, 18/21, 24/28, 36/42, 120/140, 90/106, etc.
1/7
two fractions are equivalent 21 over 23 = 42/46, 63/69
6 over 10
27/42 = 9/14 or 18/28
30/42 = 5/7 = 10/14
5/6 is one possibility
2/3 or 20/30
2 over 7 and 12 over 42
21 over 30 and 7 over 10
1/7 is one of the infinite number of fractions equivalent to 6/42. Others are 2/14, 3/21, 4/28, and so on.
If you mean 42 then as improper fractions they are 42/1 and 84/2