4*x-1-cos(x)
    e^x+10*x-2
    2x＝2
    4x^2-24x+27=0
    1/x-x=3/2
    x^2 + 5x - 6 = 0
    lg(x+3.15)=1.216
    k-4+log(10,(k-4)/111)
    x-3+log(10,（x-3)/11)
    x+log(10,x)
    39=arctan0.2w+arctan0.5w
    39=arctan0.2w+arctan0.5w
    50x-100+160=55x-55
    50x-100+160=55x-55
    70（1+ x）∧400=2000000
    59.08=X-2/x
    x^2+4*x+2=0
    V=2571+2512+152.49+0.04V+244.47+0.0538V+0.1V
    V=2571+2512+(2571+2512)*0.03+0.04V+244.47+5.38V+10V
    （2/5）/18*13=X

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