5x - 15(x - 20) = 900
5x - 15x + 300 = 900
- 10x = 900 - 300
- 10x = 600
x = 600 : (- 10)
x = - 60
Объяснение:
.......................
5x - 15(x - 20) = 900
5x - 15x + 300 = 900
- 10x = 900 - 300
- 10x = 600
x = 600 : (- 10)
x = - 60
Объяснение:
.......................