2: 4 × ((5 - 6) + 7)

3: 4 × (5 - (6 - 7))

4: 4 × (5 + 7 - 6)

5: 4 × ((5 + 7) - 6)

6: 4 × (5 + (7 - 6))

7: 4 × (7 + 5 - 6)

8: 4 × ((7 + 5) - 6)

9: 4 × (7 + (5 - 6))

10: 4 × (7 - 6 + 5)

1 1: 4 × ((7 - 6) + 5)

12: 4 × (7 - (6 - 5))

13: (5 - 6 + 7) × 4

14: ((5 - 6) + 7) × 4

15: (5 - (6 - 7)) × 4

16: (5 + 7 - 6) × 4

17: ((5 + 7) - 6) × 4

18: (5 + (7 - 6)) × 4

19: (5 + 7) × (6 - 4)

20: (6 - 4) × (5 + 7)

2 1: (6 - 4) × (7 + 5)

22: (7 + 5 - 6) × 4

23: ((7 + 5) - 6) × 4

24: (7 + (5 - 6)) × 4

25: (7 + 5) × (6 - 4)

26: (7 - 6 + 5) × 4

27: ((7 - 6) + 5) × 4

28: (7 - (6 - 5)) × 4