x-x*.1=5800
    2000/（2000-x）=2
    (x+1000)/x=1.5
    0.0614x-15796000/x=98.713765
    x^3-24x^2+160x-289=0
    （38.584+x）×0.85＝38.584+66.968-x
    （38.584+x）×0.85＝38.584+67.968-x
    （38.584+x）×0.85＝38.584+68.968-x
    （38.584+x）×0.85＝38.584+69.968-x
    （38.584+x）×0.85＝38.584+70.968-x
    x/(x+700)=0.9
    x/(x+700)=0.8
    x/(x+700)=0.7
    x/(x+700)=0.8
    x/(x+700)=0.6
    x/(x+700)=0.4
    x/(x+700)=0.3
    x/(x+700)=0.2
    x/(x+700)=0.5
     x/(x+700)=0.1

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