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
100+(x-100)/10=200+[x-200-100-(x-100)/10]/10
100+10x-1000=200+[x-300-10x+1000]/10
10x-900=200+(700-9x)/10
10x-1100=70-90x
100x=1170
x=11.7

100+(x-100)/10=200+[x-200-100-(x-100)/10]/10
90+x/10=200+[x-300-x/10+10]*1/10
90+x/10=200+9x/100-29
x/100=81
x=8100