arctan10x－arctanx－arctan0.1x＝0
    （x²+x）²-8（x²+x）+12=0
    （x²+x）²+8（x²+x）+12=0
    2/3t²-2t=1
    x=(4*1.499-0.775*e^(0.00627*38.94))/(4*1.499*e^(0.00627*38.94)-0.775)
    x=(0.775-4*1.499*e^(-0.01275*38.94))/(0.775*e^(-0.01275*38.94)-4*1.499)
    0=-4.30323+0.68643x-0.000188442x^2
    0=10.63905+0.83242x-0.000120145x^2
    (u+4)/0.2=(u^2)/(3.6)
    (u+4)/0.2=u^2/3.6
    2^z+7^z+z^2+z=-125
    2^z+7^z+z^2+z=-125
    √z+√(-z)=√2
    e^√x+e^(-√x)=3
    e^√x+e^(-√x)=2
    (√x)^4=1
    s^3+3s^2+2s+1.06=0
    x^2-2468x+1234^2=0
    x=(4*1.499-0.775*e^(0.00394*38.94))/(4*1.499*e^(0.00394*38.94)-0.775)
    x=(0.775-4*1.499*e^(-0.01316*38.94))/(0.775*e^(-0.01316*38.94)-4*1.499)

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