x-(x*1/5+15)-(x*1/4-25)=120
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x-(x*1/5+15)-(x*1/4-25)=120x-(x*1/5+15)-(x*1/4-25)=120x-(x*1/5+15)-(x*1/4-25)=120去括号x-(1/5)x-15-(1/4
x-(x*1/5+15)-(x*1/4-25)=120
x-(x*1/5+15)-(x*1/4-25)=120
x-(x*1/5+15)-(x*1/4-25)=120
去括号 x-(1/5)x -15 - (1/4)x +25 = 120
x的系数 1-(1/5)-(1/4)=11/20
剩下的全都移到右边 110
x= 110* (20/11) =200
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