x^x=x
    x^x=1
    120*(2/3)+x*(1/3)=90
    125*(2/3)+x*(1/3)=90
    75*(2/3)+x*(1/3)=65
    75*(2/3)+x*(1/3)=120
    125*(2/3)+x*(1/3)=130
    75*(2/3)+x*(1/3)=100
    75*(2/3)+x*(1/3)=130
    64*x+165*(1-x)=120
    80*x+210*(1-x)=130
    165*x+64*(1-x)=80
    17x^3-307x^2+1783x-3301=0
    60*(2x+x+2)=55*(2x+2)+60*x
    （6+π）x＾2＝80-18π-36x+6πx
    （x×x-4x+7）（x×x+3）=12
    x^3-2*x^2+0.5*x-0.2=0
    121x/(121+x)=605/6
    16m^4-20m^2+6m+1=0
    16m^4-20m^2+6m-1=0

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