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    x^3-x^2+x+1=0
    8x+1—4x=25
    [(300*2x/4-2x)^2]/{[(300*(3-3x)/(4-3x))^3]*[(3-x/4-3x)*300]}=1.5*10^(-5)
    [(300*2x/4-2x)^2]/{[(300*(3-3x)/(4-3x))^3]*[(3-x/4-3x)*300]=1.5*10^(-5)
    [(300*2x/4-2x)^2]/{[(300*(3-3x)/(4-3x))^3]*[(3-x/4-3x)*300]=1.5*10^-5
    20—2x=4.2
    x+3x+3x+4=88
    x-lnx=5
    4.3172=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    √3x+1.5=x+2
    32*x-x^2=120
    600x-x^2=(400-x)^2
     xln(16.67x) = 0.149
     xln(16.67x) = 0.02644
     xln(6.2893x) = 0.02644
     xln(6.29x) = 0.02644
     xln6.29x = 0.0265
     xln6.29x = 0.02644
     xln6.2893x = 0.02644
     xln6.2893x = 0.034264

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