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    (x-200000)/x=0.2
    (1+3%)*(1+x)=(1+8%)^2
    (1+3%)*(1+x)=(1+8%)^2
    0.108=0.8*(1+x)/10+x
    2/X
    x^2-9x-17.98=0
    1.8x^2+0.3x-220=0
    1/2m×m-4m=6
    x+0.01x=37781.4
    x+11.83+2.11+0.08=5x
    x(x+11.83+2.11+0.08)=0.2
    x/(9.49+0.22+0.09)=0.2
    x=2arctanx
    x=arctanx
    4.5945=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    4.5945=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    4.5945=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    2.3421=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    2.3421=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((1-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    2.3421=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((1-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))

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