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    65434-365.309*(2000+273.15)+8.314*(2000+273.15)ln[(100/x)-1] = 0
    x^2-1.792x+0.3614=0
    65434-365.309*(700+273.15)+8.314*(700+273.15)ln[(100/x)-1] = 0
    65434-365.309*(1300+273.15)+8.314*(1300+273.15)ln[(100/x)-1] = 0
    65434-365.309*(1300+273.15)+8.314*(1300+273.15)ln[(100/x)-1]=0
    10*z^(2)+79*z+11=0
    100x-4=(115x-4)(1+x)^2.75
    arctan(0.2x)+arctan(0.5x)+arctan(2x)=180
    -363282-1.551*(2000+273.15)+8.314*(2000+273.15)ln[(100/x)-1]=0
    -363282-1.551*(1800+273.15)+8.314*(1800+273.15)ln[(100/x)-1]=0
    -363282-1.551*(1500+273.15)+8.314*(1500+273.15)ln[(100/x)-1]=0
    X=5X
    -363282-1.551*(700+273.15)+8.314*(700+273.15)ln[(100/x)-1]=0
    -363282-1.551*(1200+273.15)+8.314*(1200+273.15)ln[(100/x)-1]=0
    -363282-1.551*(1300+273.15)+8.314*(1300+273.15)ln[(100/x)-1]=0
    4s^3+0.4s^2+0.01s=1.46*10^-10
    x-0.2(x-800)=1760
    10X=15X
    45/sqrt(x+4)/(x+9)/sqrt(x+9)=1
    arctan(x/2)+3*arctan(x/3)=180

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