(4 - х) + 1 1/5 = 3 7/60
4 - х + 1 12/60 = 3 7/60
- х = 3 7/60 - 4 - 1 12/60
- х = 3 7/60 - 5 12/60
- х = - 2 5/60
х = 2 1/12
