Пошаговое объяснение:

1)

6 3/11 + х = 10 6/7

х = 10 6/7 - 6 3/11

х = 10 66/77 - 6 21/77

х = 4 45/77

2)

9 5/36 - х = 2 4/9

х = 9 5/36 - 2 4/9

х = 9 5/36 - 2 16/36

х = 8 41/36 - 2 16/36

х = 6 25/36

3)

х - 5 17/60 = 7 9/20

х = 7 9/20 + 5 17/60

х = 7 27/60 + 5 17/60

х = 12 44/60

х = 12 11/15