x/（1-x）=0.0034
    （x－20-36）×0.75÷80=（x－20）×0.75÷100
    （x－20-36）×0.75÷80=（x－20）×0.75÷100
    250+30×210-210x=1455
    （x－20-36）×0.75÷80=（x－20）×0.75÷100
    x75-4200=60x-40
    10=-1.3*e^（-x/1.3901）+1.2780
    10=-1.3*e^（-x/1.3901）+1.2780
    10=-1.3*e^（-x/1.3901）+1.2780
    10=-1.29999*e^（-x/1.3901）+1.2780
    10=-1.29999*exp（-x/1.3901）+1.2780
    x（500-x）=26400
    3.10136πx-sin（2πx）-0.4589π=0
    (8333-x)[1-(1+0.001*x)^299]+x
    (8333-x)[1-(1+0.001*x)^299]=-x
    (8333-x)[1-(1+0.001*x)^299]+x=0
    (a+2)/4=0.75
    (a+2)/4=3/4
    (a+2)/4=0.75
    (a+2)/4=3/4

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