2/3=x*0.05^1.070969
    2/3=x*0.05^0.674162
    66*0.0001^x=0.05^x
    2a=8
    3x*0.05^1.070969=2
    5X+4X=45
    66*0.001^x=0.05^x
    15*504+8y=40000
    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

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