x(1-x^18)/(1-x)=140.3556885
    x(1-x^18)/(1-x)=128.2041954
    x(1-x^18)/(1-x)=108.0078523
    x(1-x^18)/(1-x)=68.29124161
    0.0177-0.71x+x×x=0
    x(1-x^18)/(1-x)=174.1193006
    x(1-x^18)/(1-x)=151.8649579
    x(1-x^18)/(1-x)=137.6441156
    x(1-x^18)/(1-x)=92.24791084
    x(1-x^18)/(1-x)=76.24182037
    x(1-x^18)/(1-x)=94.63201529
    x(1-x^18)/(1-x)=92.92490976
    x(1-x^18)/(1-x)=95.00774875
    x(1-x^18)/(1-x)=150.5695336
    x(1-x^18)/(1-x)=161.8776381
    x(1-x^18)/(1-x)=175.7483852
    x(1-x^18)/(1-x)=174.1133284
    x(1-x^18)/(1-x)=83.64268267
    x(1-x^18)/(1-x)=188.0994424
    x(1-x^18)/(1-x)=90.56220368

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