1194*x+3084.5*x^2/sqrt(1-x^2)-1194*x/sqrt(1-x^2) = 928
    1.925X+(1000/126)*(850-X)=2380
    1194*x+3084.5*x^2/sqrt(1-x^2)-1194=928
    500+X/44.7=204(1+X)
    1000+X/44.7=204(1+X)
    1/（d+1）+1/（d+3）+1/d=0
    x/(2000+x)=20%
    x*x*x+x=3
    520+480/x=-0.04(175-2000x)^2+14(175-2000x)
    x*x*x+x=3
    1/（d+1）+1/（d+3）=1/d
    1/d+1/(d+3)=1/d
    1/d+1+1/d+3=1/d
    0.134699/x＝0.1289/0.86289
    0.4/100.58＝x/33.87
    (20X)+25(80－X)=1700
    X(80－X)=1700
    e^x-3+x＝0
    -(4-x)(6+x)+(4-x)[(5-x)(3-x)-9]=0
    x^2+x^-2=2

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