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    a*3=9
    sqrt(x^2-8√2*x+40)+sqrt(x^2-4√2*x+40)=9
    sqrt(x^2-4x+5)+sqrt(x^2-2x+5)=9
    !(x)=3
    !(x)
    3x/5+3/5=-x^2+3x+4
    3x/5+3/5=x^2-5x+4
    (1+1/x)x
    (4/3+a)/[4-9a/(3a-1)]=1/2
    (4/3+a)/(4-9a/3a-1)=1/2
    -15/2x^2+12x-4
    5=a(0-50)²+25
    (40÷x)×(40÷x)+x×x=100
    5/102+10/133.58+3/45+8/44.7+5/50+5/53.06+x/500+(39-x)/1000=0.59
    20(1-x)=16.2
    x^2-2x-3=-5
    x^2-2x-3=5
    x^2-2x-3=0
    36+X=5
    2b^3-9b^2-81b-156=0

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