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
    x^3+2x^2+10x=20
    x^5-15x^4+85x^3-225x^2+274x-120=0
    x+x*0.06=361
    lg x=-1780/308.15+0.00754×308.15+4.53
    tan-1 of 0.125
    1-7x+6x^2-x^3=0
    8*k^4-8*k^3+8*k^2+6*k-1=0
    0.2x=0.6(8.8-x)

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