作业帮(0.4x-15)/30=[(1-0.4)x+15]/50
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/10 03:03:41
![(0.4x-15)/30=[(1-0.4)x+15]/50](/uploads/image/z/5916944-56-4.jpg?t=%280.4x-15%29%2F30%3D%5B%281-0.4%29x%2B15%5D%2F50)
(0.4x-15)/30=[(1-0.4)x+15]/50
(0.4x-15)/30=[(1-0.4)x+15]/50
(0.4x-15)/30=[(1-0.4)x+15]/50
左右乘150
5（0.4x-15）=3[(1-0.4)x+15]
2X-75=1.8X+45
0.2X=120
X=600
50（0.4x-15)=30(0.6x+15)
20x-15*50=18x+30*15
2x=15*80
x=15*40=600
(0.4x-15)/30=(0.6x+15)/50
得出：
50((0.4x-15)=30(0.6x+15)
20x-750=18x+450
得:
2x=1200
x=600