66×0.001^x=0.05^x
    x+(x+31)=311
    0.618×（180-n）＝n
    x/（x^2+1）
    lnx＋x＝2e
    e^x-1
    6+x=(x^4+30-12x^2)^2
    0.34*x=4175
     478mod9
    6*x+1=7*(x-3)
    9.424778x^3-120x+182.4=0
    -arctan（w）-arctan（2*w）=-π÷2
     arcos0.356
    （0.01-x）*（0.01-x）/x^2=2.25
    （0.01-x）*（0.008-x）/x^2=2.25
    （0.01-x）*（0.012-x）/x^2=2.25
    （0.01-x）*（0.012-x）=2.25*x^2
    (x+1)(x×x-3×x+2)=0
    x^2-36x+325=0
    cosx＝-0.3

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