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    (7-10a)/((1.3+a)(2.3+a))
    3s^2+14s+10=0
    0.3s^2+14s+10=0
    x²+50x+85000=0
    (1/d)+(1/d+1)+(1/d+2)+(1/d+5)=0
    138.2*10^6=1.0*14.3*200x(460-x/2)
    0.9x²-x=0.02
    x^2+1.76x10^-5-1.76x10^-6=0
    x^2+1.76x10^-5x-1.76x10^-6=0
    arctan2.666=x
    arctan8/3=x
    arctan0.5=x
    x*x-1=0
    x*x-sin(x)-1=0
    9x^11-11x^10+2=0
    9x^11-10x^10+2=0
    [2(k-1)]²-4(k²-1)=0
    2.25*x^2+(1-0.5*x)^2*x=100
    x^3=4x-4
    ln2-x

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