5/7 +1/7=6/7
9/13 + 3/13=12/13
12/19 + 5/19=17/19
26/37 +9/37=35/37
8/11 + 2/11=10/11
6/17 + 5/17=11/17
14/25 + 8/25=22/25
18/49 + 16/49.=34/49
5/7 -1/7=4/7
9/13 - 3/13=6/13
12/19 - 5/19=7\19
26/37 - 9/37=16/37
8/11 - 2/11=6/11
6/17 -5/17=1/17
14/25 - 8/25=6/25
18/49 - 16/49=2/49
5/7 +1/7=6/7
9/13 + 3/13=12/13
12/19 + 5/19=17/19
26/37 +9/37=35/37
8/11 + 2/11=10/11
6/17 + 5/17=11/17
14/25 + 8/25=22/25
18/49 + 16/49.=34/49
5/7 -1/7=4/7
9/13 - 3/13=6/13
12/19 - 5/19=7\19
26/37 - 9/37=16/37
8/11 - 2/11=6/11
6/17 -5/17=1/17
14/25 - 8/25=6/25
18/49 - 16/49=2/49