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    x^3-6x^2+12x+4=0
    176x^3+6x+7=0
    -lnx=9.2
    x^(2)-2x-1=0
    X^3-5x^2-x+21
    X3-5x2-x+21
    0.8(x-2)<0.7(x+20)
    3x^2-64x+64*4=0
    24(18X+500)+400=54X
    24(18X+500)-400=54X
    x*x*x-2-4*x=0
    x^2+4x+5=0
    x^3-12x^2+21x+54
    10000000*x*x-4250*x+1=0
    1.5x=100+x
    4500*12*0.9-60%*70X*(4.9%+2%)/40%*70X+5%*70X=3.8%
    x(x+2)=1.99*1.99
    x(x+2)=1.99
    ln(x+3)=1
    9╱8(3╱2X+500)+400=2X

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