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    20.35x^1.87-58557lnx-4426739=0
    20.35x^1.87-31589.9lnx-4946874=0
    (0.1-x)/(2x^2+x)=1.7*10^7
    -1.072569191824066=(1/x)*ln(1-x)
    188x^1.87-31590lnx-4945593=0
    0.0188x^1.87-31590lnx+508946.88=0
    x/(1+x)=10
    -1.100315711457124=(1/x)*ln(1-x)
    X+x*0.09=9000
    x+x*0.09=15
    x^-0.5=1.74-2lg(0.001-0.00003279x^-0.5)
    x^-0.5=1.74-2lg(2*0.0005-18.7*x^-0.5/359710)
    x^-0.5=1.74-2lg(0.001-0.00006559*x^-0.5)
    x^-0.5=2lg(179854*x^0.5)-0.8
    x^-0.5=1.74-2lg(0.001-18.7*x^-0.5/179854)
    x^4+(x^3+x)^2=0.01
    x^4+(x^3+x)^2=200
    x^4-(x^3+x)^2=200
    x^2*(x^2+25)*(x^2+225 )= 250*250
    x^4*(x^2+25)*(x^2+225) = 250

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