2000（1+x）²=3380
    x^4-18x^2-63=0
    4x^2+16x+40=0
    4x^3+24x^2+72x+80=0
    x^4-43.5x^2+45.5=0
    x^2-43.5x+45.5=0
    x^4-43.5x^2+45.5=0
    5x^4+42x^3+130.5x^2+159x+45.5=0
    3x+3-12=4x-2
    (x+1)/4 -1=(2x-1)/6
    x5
    x＾3-3x＋1＝0
    2x^3+20x^2+50x+30=0
    x = (15.54/((13.19/1.1)+692.15))^2
    x = (15.54/((13.19/4.3)+692.15))^2
    ln（x/（2-x））
    x = (24.95/((13.19/5.01)+692.15))^2
     x = (34.93/(13.19+692.15))^2
    x=(24.95/(13.19+692.15))^2
     13.73 = 5.01*((13.19/1)+692.15)*((x^(0.5+1))/(0.5+1))

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