x=x+π
    x=x+1
    lg(38.4/2.14)=(229300/2.303/8.314)(1/650-1/x)
    (0.6)/X=0.97
    X/(0.7-X)=97/24
    X/(0.7+X)=97/24
    7x-2*3=2x
    x+(x*3%)=3480042.05
    t*ln(t/30)=150
    t*ln(t/30)=3/20
    x=1.33%x+39400
    x=1.33%+39400
    25×4-x=44
    100-x-25×4=44
    100-25×4 -x=44
    180*10^3=360*x-360*508+14.3*300*169.33
    180^3=360*x-360*508-14.3*300*169.33
    180^3=360*x-360*508-14.3*300*169.33
    6*0.25*3.14*x^2 = 190*10^3/(0.8*300)+47.5*10^6/(0.4*0.9*300*360)
    6*0.25*3.14*x^2=190*10^3/(0.9*(4-0.08x)*sqrt(19.1/360))+47.5*10^6/(1.3*0.9*300*360)

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