30/x+60/(1+1/9)=21怎么算?

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30/x+60/(1+1/9)=21怎么算?
30/x+60/(1+1/9)=21怎么算?

30/x+60/(1+1/9)=21怎么算?
30/x+60/(1+1/9)=21
30/x+60x9/10=21
30/x=21-54
x=30/-33
x=-10/11