x-31/x+1
    -90-arctans-arctan(0.1*s)=-120
    -90-arctans-arctan(0.1*s)=-180
    20/2-1=（x/2）^0.2*（x/2-1）
    -90-arctans-arctan(0.1*s)=-120
    20X+12（8一X）=112
    20/x-1=（x/2）^0.2*（x/2-1）
    9=(x/2)^0.2*(x/2-1)
    abs4+2a/√（a²+1） = 2
    abs4+2a/√a²+1 = 2
    abs（4+2a）/√a²+1=2
    39.1748*0.2*x^0.2+x=8.096043
    x2=6400
    8.095996-x=39.175*0.2*x^0.2
    39.1748*0.2*x^0.2+x=20
    20-x=39.175*0.2*x∧0.2
    12x^2=1912.5
    20-x=0.7*x∧(1/1.13)
    0.7*x^0.885+x=20
    6x^2+4x=1912.5

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