0.4X/(X+5)=0.3怎么解

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0.4X/(X+5)=0.3怎么解
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0.4X/(X+5)=0.3怎么解
0.4X/(X+5)=0.3怎么解

0.4X/(X+5)=0.3怎么解
0.4X/(X+5)=0.3
0.4X=0.3(X+5)
0.4X=0.3x+1.5
0.4x-0.3x=1.5
0.1x=1.5
x =15