76308x+861589440＝208553.391x-13185208.831
    (100/3)(10cos(x)-5/cos(x))(tan(x))=(250cos(x)-50sin(x))(5tan(x)sin(x))/cos(x)
    c^2-3^(3/2)c+7=0
    x=ln(2/2-x)
    2x^2+x-1=0
    2x^2+x-1=0
    x^2+x+2=0
    8854.81*10^6=22.4*2250x（1850-x/2）
    1/x = 2.035*lg(644684.44*x)-0.91
    1/x = 2.035*lg(320600*x)-0.91
    1/x = 2.035*lg(222600*x)-0.91
    1/x = 2.035lg(222600*x)-0.91
    1/x=2.035lg(644684.44*x)-0.91
    arctanx=0.92
    arctanx=0.92
    0.025+1.3*(x-0.025)=0.22
    elnx+x=0
    150=400-2.5x
    10x+4x^2=50
    x^27=27^x

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