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    20.5*x+5*4.2=25.5*(x-0.08)
    23.5*x+2*4.2=25.5*(x-0.08)
    e^x * (x-1) / (x+1) = 1+0
    e^x * (x-1) / (x+1) = 1+10
    4.2714=((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))
    x/131+16.5/87-.1=0.0019(116.5+X)
    (105124840.05-x)/105124840.05=0.26
    4.7189=((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))
    25+x=33.475+149-x
    (3.3+c)×7.98=12c
    -1/x=-8.25
    4x×x+4÷9-4√3÷3×x=1
    a^2-4*a+800=0
    (e^(-x))*(1+x) + (1+10)*(1-x)=0
    (e^(-x))*(1+x) + (1+0)*(1-x)=0
    4.3682=((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))
    1149=((0.021*x^1.85+1028)^0.5)*x^0.84
    5.4072=((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))
    65n+3.5n^2+3.5n=1880
    65n+3.5n*2+3.5n=1880

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