x-1/3[x-1/3(x-9)]=1/9(x-9)解方程

Question

x-1/3[x-1/3(x-9)]=1/9(x-9) 解方程

Answer 1

x-1/3[x-1/3(x-9)]=1/9(x-9)
两边同时乘以9
9x-3(x-x/3+3)=x-9
9x-3x+x-9=x-9
7x-9=x-9
6x=0
x=0
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