12x-6x-3x=21
    8x-5(x-2)=25
    4(x+5)+3x=48
    9.83*0.81^3-31.32*0.81^2-20*0.81+20x=0
    1.1x^3+45.6x^2-38x=0
    arctan(0.8x)-arctan(0.8)=30
    (1+k+k^2)*(8.6/5.1)^2=(1-k)^2
    (1+k+k^2)*(8.6/5.1)^2=1-k
    0.8(x-1)/(1+0.64x)=0.5
    3x/(2-x^2)=sqrt(3)
    10.1x/(1-x^2)=sqrt(3)
    (k-1)/((k^2+k+1)^0.5)=0.207423356862745098039
    (k-1)/(k+1+k^2)=0.207423356862745098
    x2 + 11.66x -6.69=0
    y^2-64y+49
    70-x＝ln(70/x)
    (1+k^2)×(9.9/5.1)^2=1-k
    (1+k^2)×(51.1/5.1)^2=(k-1)^2
    (9.9/5.1)×(1+k^2)=(1-k)^2
    （X+20.16）/（X+20.16+21432）=0.15

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