x-⅓
    （x-15）（x-20）＝150
    96=6/(1+0.1111)+6/(1+0.0771)^2+106/(1+x)^3
    96=5/(1+0.1111)+5/(1+0.0771)^2+106/(1+x)^3
    96=5/(1+0.1111)+5/(1+0.0771)^2+5/(1+x)^3
    19x-2=17x+58
    x^3-12*x^2+21x+54
    -65x^2+191x+81 = 0
    -65x^2+191x+81=0
    10000/x+10000/(x+17.92)=150
    61.8/94+x=0.618
    sin(x)/sin(x+60)=sqrt(3)sin(30-x)/cos(x)
    2sqrt(3)sin(60-x)sin(x)/(3sin(x+60))=sin(x+30)sin(30-x)/(2cos(x))
     (1+0.111111)*(1+x) = (1+0.0771)^2
     (1+0.111111)*(1+x) = (1+0.077136)^2
    (1+0.111111)*(1+x)=(1+0.771)^2
    96=6/(1+x)+6/(1+x)^2+106/(1+x)^3
    95=5/(1+x)+105/(1+x)^2
    sin(x)cos(x)+sqrt(3)cos(x)^2=sqrt(3)
    96=6/(1+0.111111)+6/(1+0.077136)^2+106/(1+x)^3

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