100+(X-100)/10=200+[X-200-100-(X-100)/10]/10

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100+(X-100)/10=200+[X-200-100-(X-100)/10]/10
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100+(X-100)/10=200+[X-200-100-(X-100)/10]/10
100+(X-100)/10=200+[X-200-100-(X-100)/10]/10

100+(X-100)/10=200+[X-200-100-(X-100)/10]/10
两同时乘以10,等于
1000+x-100=2000+x-200-100-(x-100)/10
2000+x-200-100-1000-x+100=(x-100)10
800=(x-100)10
8000=x-100
x=8100

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