Yes.
7/10, 14/20, 21/30
21 is a factor of both 21 and 42.
These fractions are all equivalent in value: 2/7, 4/14, 6/21, 8/28, 10/35, 12/42, 14/49, and so on.
equivalent fraction for 21 over 23 = 42/46
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.
13/14 + 5/6 = 39/42 + 35/42 = 74/42 = 37/21 or 116/21
21/25 = 42/50
1/2 ,
42/50
2/6, 7/21, 1/3, 28/84, etc, etc, ETC.
two fractions are equivalent 21 over 23 = 42/46, 63/69
3/2 = 21/14 = 42/28