Ответ:

11/7

Пошаговое объяснение:

1. 5 - 2/7 = 35/7 - 2/7 = 33/7

2. 3 1/2 - 2 3/7 = 7/2 - 17/7 = 49/14 - 34/14 = 15/14

3. 1/7 + 2/7 = 3/7

4. 33/7 + 15/14 = 66/14 + 15/14 = 81/14

5. 81/14 - 3/7 = 81/14 - 6/14 = 77/14 = 11/7