x^2-x+3=0
    4*x^2-4x+1=0
    x^3-4x-3=0
    2x>3x-2 (2x-1)/3≥1/2x-2/3
    (2x-1)/3-(10x+1)/6≥5/4x-5
    -x+1=3/16x
    4*a*a*a+6*a*a-4*a-3=0
    a*a*a+6*a*a-4*a-3=0
    a^3+6*a*a-4*a-3=0
    3*（20-x）^2=6*(5-x)^2
    3x^2-195x-1650
    1+2x/3>x-1
    1+2x/33>x-1
    x+1<=2 1+2x/33>x-1
    x+1<=21+2x/33>x-1
    (x+4)^(2)=5(x+4)
    1.02^n=2
    (0.4+2x)×（0.4+2x）÷(1-x)=0.9
    (0.4+2x)（0.4+2x）÷(1-x)=0.9
    (x+21)^2=432

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