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    -4x^3+25x^2-20x+4=0
    x=(1.25*(e^(6*x)+1)/(e^(6*x)-1))-(1.25/3*x)
    x=1.25*(((e^(6*x)+1)/(e^(6*x)-1))-(1/3*x))
    x=1.25*((1/((1-e^(-6*x))/(1+e^(-6*x))))-(1/3*x))
    x=1.25*((1/((1-e^(-2*x))/(1+e^(-2*x))))-(1/3*x))
    6-x=√(xx+16)
    A*A+A=210
    6-x=√xx+16
    0.0133^2=2/x-2*(1-e^(-x))/x^2
    xxx-5xx+16x=80
    (1+90/100)X=505875
    √2((√3+1)x)^2=(2√3+√2x)^2
    x*(1/18084+1/19560+1/29895)=1
    1+x²=(5-x)²
    1+x*x=(5-x)*(5-x)
    (a-2)*a+(a-1)=19
    -(x-3)^2
    x*tanx=1
    x*tanx=1
    x*tanx=1

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