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    -140=8.314×298×lnx
    60*(x^3)+1920*(x^2)-23*x-439=0
    1/(4-x)+4/(4+x)
    X8-16=X20+30
    x8-16=x20+30
    ((3.47-2.28)/130+x)*83=2.28
    (4x/(4+x))/(1.69+(4x/(4+x)))=0.7
    (4x/4+x)/(1.69+(4x/(4+x)))=0.7
    2.2e4=9.59e8*x*((1-0.058*lnx)/(3552+x^2)^(3/2))
    x(6-x)=3
    (500×12^3)/12+500×12×(134.93+0.512)^2+(500×12^3)/12+500×12×(134.93-0.512-12)^2+2×n×[(12×(400-12)^3)/12+12×(400-12)×1^2 ]
    (1.1/130+x)*83=2.3
    0.12925=((0.021*x^1.85+134.75)^0.05)*x^0.84
    0.0564=((0.021*x^1.85+134.75)^0.05)*x^0.84
    16000x^2-12000x-6000
    (e^x/sinx)×π/4
    (e^x/sinx)×π/4
    (e^x/sinx)×π/4
    x=191+(x*0.05)+(x*0,02)
    x=191+(x*0.25)+(x*0,02)

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