x(1-x^18)/(1-x)=286.0691422
    x(1-x^18)/(1-x)=180.9088116
    x(1-x^18)/(1-x)=310.2609565
    x(1-x^18)/(1-x)=229.67471
    2*x^2+3*x-1=0
    x(1-x^18)/(1-x)=186.1156761
    x(1-x^18)/(1-x)=242.9184406
    x(1-x^18)/(1-x)=239.7683148
    x(1-x^18)/(1-x)=351.1974427
    x(1-x^18)/(1-x)=208.0072154
    x(1-x^18)/(1-x)=67.933446
    x(1-x^18)/(1-x)=296.577919
    x(1-x^18)/(1-x)=327.6814256
    x(1-x^18)/(1-x)=83.11597833
    x(1-x^18)/(1-x)=176.8825376
    x(1-x^18)/(1-x)=67.10785213
    x(1-x^18)/(1-x)=235.0013856
    x(1-x^18)/(1-x)=216.9648096
    x(1-x^18)/(1-x)=146.5356752
    x(1-x^18)/(1-x)=125.4333357

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