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    2x^3+3x^2-12x-40=0
    -74435-91.715*(1300+273.15)+8.314*(1300+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    2x^3+3x^2-12x-13=0
    (0.50-x)*(0.045-x)/(0.050+X)/(0.040+X)=0.517
    10.85384x^(2)-1=0
    2.64+x=15.3
    -437609-93.266*(1300+273.15)+8.314*(1300+273.15)ln(([(100/x)-1]^11)*0.1^1 )= 0
    840((1-(1+i)^(-60))/i)+940((1-(1+i)^(-60))/i)(1+i)^(-60)+1040((1-(1+i)^(-60))/i)(1+i)^(-120)=104000
    -437609-93.266*(1300+273.15)+8.314*(1300+273.15)ln(([(100/x)-1]^11)*0.01^1 )= 0
    -437609-93.266*(1200+273.15)+8.314*(1200+273.15)ln(([(100/x)-1]^11)*0.01^1 )= 0
    -437609-93.266*(1200+273.15)+8.314*(1200+273.15)ln(([(100/x)-1]^11)*0.1^1 )= 0
    -437609-93.266*(1100+273.15)+8.314*(1100+273.15)ln(([(100/x)-1]^11)*0.1^1 )= 0
    -437609-93.266*(1100+273.15)+8.314*(1100+273.15)ln(([(100/x)-1]^11)*0.01^1 )= 0
    -437609-93.266*(1000+273.15)+8.314*(1000+273.15)ln(([(100/x)-1]^11)*0.01^1 )= 0
    103316.52/x=(1-1.065^(-15))/0.065
    -437609-93.266*(1000+273.15)+8.314*(1000+273.15)ln(([(100/x)-1]^11)*0.1^1 )= 0
    -437609-93.266*(900+273.15)+8.314*(900+273.15)ln(([(100/x)-1]^11)*0.1^1 )= 0
    -437609-93.266*(900+273.15)+8.314*(900+273.15)ln(([(100/x)-1]^11)*0.01^1 )= 0
    103316.52=x*(1-1.065^(-15))/0.065
    -437609-93.266*(800+273.15)+8.314*(800+273.15)ln(([(100/x)-1]^11)*0.01^1 )= 0

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