Question

78-(15*Х/9-5)*7=156/2

Answer 1

78 - (15х/9 - 5)*7 = 78
78 - 105х/9 + 35 = 78
113 - 105х/9 = 78
- 105х : 9 = -113 + 78
- 105х = 9 (-113 + 78)
- 105х = -1017 + 702
- 105х = - 315
       х = 3