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    (2a-240)/(a-480)-5=480/(a-240)
    (2a-240)/(a-480)+5=480/(a-240)
    (a-480)/(2a-240)=480/(a+240)
    (a-480)/480=(2a-240)/(a+240)
    s^3+3s^2+s+1=0
    X+X*0.13=62000
    (x+155.56^2/24*x)*0.04+77.78-155.56^3/240*x^2=77.78
    (x+70^2/24*x)*0.69+35-70^3/240*x^2=110.47
    (x+4900/24*x)*0.69+35-343000/240*x^2=110.47
    (8081231.455+1.1X)/(7788153.95-1.1X)=X/1908151.11
    (8081231.455+1.1X)/(7788153.95-1.1X)=X/1908151.11
    (8081231.455+1.1X)/(7788153.95-1.1X)=X/1908151.11
    x^7-15x^6+89x^5-265x^4+414x^3-322x^2+105x-9
    500000X-X*X=2
    50000x-x*x=2
    x^5-9x^4+28x^3-35x^2+15x-1
    (3x+2)²=16
    10lgX=-3
    10lgX=6
    (X+1)^3-6(X+1)-8=0

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