x-x*15%=5868
    x/(3+x)=0.9524
    X*7-4*x=9
    X*7-4*7=9
    X*7-4*4=9
    X*7-X*4=9
    X*7-X*4=9
    x+lnx
    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

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