X-(1/3X+1/3X+21)=1/5(1/3X+1/3X+21)-3 怎么解
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X-(1/3X+1/3X+21)=1/5(1/3X+1/3X+21)-3怎么解X-(1/3X+1/3X+21)=1/5(1/3X+1/3X+21)-3怎么解X-(1/3X+1/3X+21)=1/5(1
X-(1/3X+1/3X+21)=1/5(1/3X+1/3X+21)-3 怎么解
X-(1/3X+1/3X+21)=1/5(1/3X+1/3X+21)-3 怎么解
X-(1/3X+1/3X+21)=1/5(1/3X+1/3X+21)-3 怎么解
3x-(x+x+21*3)=1/5(x+x+21*3)-9
3x+9=6/5(2x+63)
5(3x+9)=6(2x+63)
3x=63*6-45=333
x=111
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