(x-40)=5/7x解方程

问题描述:

(x-40)=5/7x解方程

(x-40)=5/7x
x-5/7x=40
7x-5x=280
2x=280
x=140

(x-40)=5/7x
x-40=5/7x
x-5/7x=40
2/7x=40
x=140