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6/27 + 4
6 4/9 + 5 2/9
4 13/17 + 5 4/17
3 8/11 + 2 6/11
11 8 /11 - 3 5/11
12 19/44 - 6 37/44
1 - 16/21
5 - 2 3/8
8 4/9 - 3 7/9

6/27+4=4 6/27=4 2/96 4/9+5 2/9=11 6/9=11 2/34 13/17+5 4/17=9 17/17=103 8/11+2 6/11=5 14/11=6 3/1111 8/11-3 5/11=8 3/1112 19/44-6 37/44=11 63/44-6 37/44=5 26/44= 5 13/221-16/21=21/21-16/21=5/215-2 3/8= 4 8/8-2 3/8=2 5/88 4/9-3 7/9=7 13/9-3 7/9=4 6/9=4 2/3