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    x²+4x+4²=0
    x*(1+x)*(64+x)=6400
    x²+4x-13=0
    2-2x=4+x
    36b^2-13b=0
    2+(11-3)w=18
    2+(11-9)w=6
    2256000000=13.8*1580x*(1357-x/2)
    2256000000=13.8*1580x*(x/2)
    1-0.75x= 9 5
    x^2-6x-329
    (x-68)/1.1=x/4.5
    1/3=2/x
    -85+2/(1+x)+2.25/(1+x)^2+2.75/(1+x)^3+100/(x+1)^3=0
    -85+2/(1+x)+2.25/(1+x^2)+2.75/(1+x^3)+100/(x^3+1)=0
    36b^2-13b=0
    x^2-x-2048288=0
    1/(1/12+1/x)=4
    1/(1/12+1/x)=4
    (20—x)/(20.088—x)=(20+x)/(20.039+x)

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