x = -2.01×lg(3.07×10^-6+1.05×10^-7×x)
    x/(x+15)=0.83
    x/x+15=0.83
     x = -2.01×lg(3.48×10^-6+9.26×10^-8×x)
    x = -2.01×lg(3.4536×10^-6+9.34×10^-8×x)
    0.8*（1+x）/10+x/1=10.8%
    x^-0.5 = -2.01×lg(3.4536×10^-6+9.34×10^-8×x^-0.5)
    x^0.5=-2.01× lg(3.4536×10^-6+9.34×10^-8× x^0.5)
    8x²-9√（8x-15）-9=0
    sinx=1
    3x^2+x-252=0
    3x=x+4
    28.77+6.85x^2-2.97x=65.36
    28.77+13.7x^2-2.97x=65.36
    x=-2.01× lg(3.4536×10^-6+9.74×10^-8×x)
    x(x+0.0017)=0.001(0.0983-2x)^2
    x(x+0.0017)=0.001(0.0983-2x)^2
    x(x+0.0017)=0.001(0.0983-2x)
    x(x+0.0017)=0.001(0.0983-2x)^2
    x(x+0.0017)=0.001(0.0983-2x)^2

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