x(1-X^19)/(1-X)=96.89641027
    -1.05991=(1/x)*ln(1-x)
    -x^3+12*x^2-21*x-98=0
    -1.08173=(1/x)*ln(1-x)
    -1.08898=(1/x)*ln(1-x)
    -1.05743=(1/x)*ln(1-x)
    x-x/21.75*4=5404
    -1.09423=(1/x)*ln(1-x)
    -1.04194=(1/x)*ln(1-x)
    x+0.20x=420000
    x+0.19x=420000
    x+0.18x=420000
    x+0.16x=420000
    x+0.17x=420000
    X+1070X/1870=30373
    x^2-4x+1
    x+0.12x=420000
    x+0.13x=420000
    x+0.14x=420000
    x+0.15x=420000

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