10%-x/10%-15%=496.66-0/496.66-139.31
    x^4+400x^2-160000=0
    -10.64856076x^3+10.88679981*x^2-6.108804762*x+0.275355395=0
    -10.6433235x^3+10.88692471*x^2-6.10883614*x+0.275629306=0
    0=1.131*x^3-13.635*x^2+30.594*x-29.267+0.304731403*e^x
    sqrt(x^2+x)
    x*0.57*2.41*1.81*1.10=1.28
    (1248*X)+(265*X)=46177.09
    y^2＋2y-8 = 0
    y^2＋2y-8 = 0
    y^2＋2y-8 = 0
    y^2＋2y-8 = 0
    y^2＋2y-8 = 0
    y^2＋2y-8=0
    x²+25x-37
    arctan(6/5*s/(1-1/5*s*s))=90
    arctan(6/5*s(1-1/5*s*s))=45
    arctan(6/5*s/(1-1/5*s*s))=45
    12-4x=23-5x
    X+138053-X/1.06*0.06+(138053-X/1.06*0.06)*0.12+(187800000+X)*0.0003= 1140000

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