-5x^(2)＋26.6x＋20.4=0
    （x-1）*（x^(2)-2）+2=0
    (abs(x-112.5)-0.5)^2=0.00392*(abs(150-x-37.5)-0.5)^2
    116x^(2)-696x+954＝0
    16（x-2）^(2)=9（x+3）^(2)
    （x-1）（x^(2)-2）+2=0
    2（x-3）=x^(2)-9
    （x+1）^(2)-25=0
    （x+1）2-25=0
    2*s^3+9.5*s^2+15*s+6 = 0
    4*s^3+12.5*s^2+15*s+6
    3x(x-1) =2(1 -x)
    0.5t*t+1.5t=4t
    3x-x^2=-7
    (4-(3/4)*x)/sqrt((x-4)^2+4-(x^2)/4)=((3/4)*x+x/sqrt(16-x^2))/sqrt(x^2+(sqrt(4-x^2/4)-2)^2)
    （x-1）^(3)-（x-1）=0
    (4-(3/4)*x)/sqrt((x-4)^2+4-(x^2)/4)=((3/4)*x+x/sqrt(16-x^2))/sqrt(x*2+(sqrt(4-x^2/4)-2)^2)
    0.68 x ×0.98+4=0.65x
    sin(x)/x=0.1717619
    x/2=x+1/3

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