C=0.15/(1-15)
    C=0.15/(1-0.15)
    C/(1+C)=15
    C/(1+C)=0.15
    C=0.9/(1-0.9)
    10/(1+10)=B
    1/(1+1)=B
    C=1/(1-1)
    C=11/(1-11)
    11=B/(1-B)
    0.01=B/(1-B)
    C-C*0.009901=0.009901
    0.01-0.01*B=B
    (0.01-0.01)*(0.01-B)=B
    0.01-0.01*B=B
    (0.01-0.01)*(0.01-B)=B
    0.01-0.01*B=B
    x-1.645x^0.5-96＝0
    x*x-1.645x-96＝0
    (x+2)^2+8/3(x^2-1)=(√33+6)/3

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