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危厚
2019-11-10 12:53:30
100/(2.5x)+5=100/x
100/x-100/(2.5x)=5
20/x-20/(2.5x)=1
20/x-8/x=1
12/x=1
x=12
100/x-100/(2.5x)=5
20/x-20/(2.5x)=1
20/x-8/x=1
12/x=1
x=12
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