0.1x+90={X-[0.1x+90]-200}*10%+200
0.1x+90={0.9x-290}*10%+200
0.1x+90=0.09x+171
0.01x=81
x=8100
(X-100)*10%+100={X-[(X-100)*10%+100]-200}*10%+200
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