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    2*(1-x^9)/(1-x)=1027
    2*(1-x^12)/(1-x)=1027
    -x^3+5*x^2-6*x+1=0
    X^2+5X+2250=0
    x=sin(arccos(2/π))-2/πarccos(2/π)
    0.5=0.09/x+(1-x)^2.47
    x=arccos(2/π)
    800*(X-0.7/4000)=0.026*ln{X/(X-0.7/4000)*6}
    800*(X-0.7/4000)=0.026*ln{X/(X-0.7)}
    1+X=2
    800*(x-0.7/4000)=0.026*ln{x/(x-0.7/4000)*6)
    x^2-33x+23=0
    2.1385=((0.021*x^1.85+2293)^0.5)*x^0.84
    (x-122.410)*10-0.6-0.6=1
    (x-122.410)*10-0.6-0.6=2
    2*(1-x^10)/(1-x)=1028
    (1-q^10)/(1-q) = 20
    (1-q^20)/(1-q)=20
    2*(1-x^10)/(1-x)=1026
    1*(1-x^10)/(1-x)=1025

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