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    y=3/4*9/4-9/4*3/2-3
    1+x+x^2=21
    (n+1)^2=21
    (n+1)^2=20
    x/0.1=(4500-x)/0.8
    24-x=0.5x
    2.4-x=0.5x
    x=6(1-2x×x)
    n×n×n-10n²+19n+30=0
    a^3-16a+24=0
    sin ( 2 * x ) - sin ( 2 * x - 60 )
    (1-10%)X+2=X-10-8
    (1-10)Xx+2=X-10-8
    sqrt(62-2m^2)/2+sqrt(2m^2+2)/2=sqrt(m^2+9)
    sqrt(66-2m^2)/2+sqrt(2m^2+2)/2=sqrt(m^2+9)
     3 * x ^ 2 + 4 * x - 4
    (2000-20x)(x-50)=12000
    (2000-20x)(x-50x)=12000
    (2000-20x)(x-50x)=12000
    3x^2-4x-4=0

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