Пошаговое объяснение:
3x+15-x+18 = 300
2x = 300-15-18
2x = 267
x = 267:2
x = 133,5
2 x +15 + 18 = 300
2 x + 33 = 300
2 x = 300 - 33
2 x = 267
x = 267/2 = 133 1/2= 133,5
Пошаговое объяснение:
3x+15-x+18 = 300
2x = 300-15-18
2x = 267
x = 267:2
x = 133,5
2 x +15 + 18 = 300
2 x + 33 = 300
2 x = 300 - 33
2 x = 267
x = 267/2 = 133 1/2= 133,5