(0.4x-15)/30=[(1-0.4)x+15]/50
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(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1505（0.4x-
(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