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    16-8(a+1)+a^2-1=0
    (2(a+1))^2-4(a^2-1)=0
    16-8(a+1)+a^2-1=0
    [50(9-7x)]²=(40x)²+(80-50x)²
    1/(1-a)=a
    6x^2-5x+1=0
    0.25x^2+x+1=0
    b^2-b+1=0
    6x+9(x-100)=4200
    (16-x)(160+40x)=3640
    9/(3x)=4
    9/(3x)=4
    9/3x=4
    70x+600+7x-200=18x
    7x+600+7x-200=18x
    X^4+X^3+X^2+X+1=0
    s^2+s+4=0
    x^2-3x-1=0
    (20X+500)*(50-X)=30000
    x^2-3x-1=0

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