2/5 + 1/5 = 3/5
2 i 1/7 + 2/7 = 2 i 3/7
3 i 1/8 + 1 i 3/8 = 4 i 4/8 = 4 i 1/2
7/9 + 1/9 = 8/9
5 i 7/10 + 1 i 1/10 = 6 i 8/10 = 6 i 4/5
6 i 2/9 + 2 i 5/9 = 8 i 7/9
