X-0.2:X-1.52-0.4= 9:7怎么解 ,
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X-0.2:X-1.52-0.4= 9:7怎么解 ,
X-0.2:X-1.52-0.4= 9:7怎么解 ,
X-0.2:X-1.52-0.4= 9:7怎么解 ,
X-0.2/X-1.52-0.4 =9/7
7(X-0.2)=9(X-1.52-0.4 )
9X-17.18=7X-1.4
2X=15.78
X=7.89