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    x+2x+13=157
    (x-300000)/x=0.2
    (16^(1-x)-1)/(1-x)=0.5*(30^(1-x)-1)/(1-x)-0.5/(1-x)
    (16^(1-x)-1)/(1-x)=0.5*(30^(1-x)-1)/(1-x)+0.5/(1-x)
    (16^(1-x))/(1-x)=0.5*(30^(1-x))/(1-x)
    (16^(1-x)-1)/(1-x)=0.5*(30^(1-x)-1)/(1-x)-0.5/(1-x)
    (16^(1-x)-1)/(1-x)=0.5*(30^(1-x)-1)/(1-x)+0.5/(1-x)
    (16^(1-x)-1)/(1-x)=0.5*(30^(1-x)-1)/(1-x)+0.5/(1-x)
    (16^(1-x)-1)/(1-x)=0.5*(30^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5
    (160^(1-x)-1)/(1-x)=1
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    1-x=x^2
    13 x ^ 2 -7 5 x + 81=0
    10/11+2X=10
    25/12+2X=10
    5/12+2X=10

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