0.3(x-9)=12.75

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0.3(x-9)=12.75
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0.3(x-9)=12.75
0.3(x-9)=12.75

0.3(x-9)=12.75
0.3(x-9)=12.75
x-9=12.75/0.3
x=9+42.5
x=51.5

12.75/0.3=42.5,
x=42.5+9
x=51.5

51.5

很值得考虑