x^3-1/6*x+1/12=0
    0.09x+x=340
    19*x+12*1.2x=850000
    18*x+13*1.2x=850000
    13*x+18*1.2x=850000
    10*x+21*1.5x=850000
    10*x+21*1.3x=850000
    10*x+21*1.2x=850000
    10*x+21*x*(1+0.2)=850000
    10*x+21*x*(1+0.2)
    X+(x*.13)=140000
    X+(x*.13)=20000
    X+(x*.13)=1600
    1.4x×0.8=24
    x（1+0.4）×0.8=24
    X+(x*.13)=19000
    x（1+0.4）×0.8
    X+(x*.13)=22000
    1.4x×0.8-x=24
    4x×0.8-x=24

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