x(1-x^18)/(1-x)=658.7795947
    x^2+x-5=0
    x(1-x^18)/(1-x)=493.840293
    x(1-x^18)/(1-x)=159.8675169
    x(1-x^18)/(1-x)=204.1977816
    x(1-x^18)/(1-x)=60.69017509
    x(1-x^18)/(1-x)=104.6295673
    4*(x+1)^2-9(x-2)^2=0
    X/2+1 -1=2+2/4-x
    x(1-x^18)/(1-x)=180.9213821
    x(1-x^18)/(1-x)=75.70420269
    x(1-x^18)/(1-x)=276.5663489
    x(1-x^18)/(1-x)=91.54584884
    x(1-x^18)/(1-x)=213.5228066
    x(1-x^18)/(1-x)=152.4201783
    (x+2)^2=4
    x(1-x^18)/(1-x)=250.4986253
    x(1-x^18)/(1-x)=98.63840138
    x(1-x^18)/(1-x)=63.22882344
    x(1-x^18)/(1-x)=223.0753843

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