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    53—4X+12X=41
    a²+1=7
    16-4aX(-5)
    16-4a
    (250-25x)×(12+3x)=0
    8+3x=4+5x
    x^2-x-2=0
    12000/(80-20x)+13200/(80+15x)=160
    x^3-2*x^2+1=0
    X²+560x-18900=0
    24= 0.6*(1+X/1000)
    12=0.6*(1+X/1000)
    12=0.6*(1+R1/1000)
    12=0.6*(1+R1/R2)
    0.6*(1+R1/R2)=12
    -x*x+1/(x*x)+x-1/x=4
    m^2-2*m-4=0
    x1+x2=3 x1*2+x2*1=4
    y^2-6*y+6=0
    x^(5/2)

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