They are: 7/13 and 14/26
two fractions are equivalent 21 over 23 = 42/46, 63/69
They are: 14/16 and 21/24
1/7 is one of then
There are an infinite number of such fractions. 14/26, 21/39 are two examples.
21 over 30 and 7 over 10
14 over 22 21 over 33
Two equivalent fractions for 21/35 are: 42/70, 3/5.
4/14, 6/21
8/14 & 12/21
9/21 & 3/7
14/22 and 21/33
They are: 14/18 and 21/27