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    5t^2+4t-0.8=0
    e^x-x^e=0
    (√z^3-√z)^2=2
    (√z^3+√z)^2=2
    z^2=-1
    1-2/x+1/x²=0
    x²-2×(x+2)-4=0
    2(x+5+19.2)=50+222-2x
    x²+2×(x+2)-4=0
    12x^2-54x+45=0
    20/x-5=10/x
    20/x-5=20/2x
    20/x+5=20/0.5x
    20/x+5=20/2x
    3000/x-2=3000/(x+50)
    (40-x)(20+2x)=1300
    81×(x-2)=69×(x+2)
    81×(x-2)=69×(x+9)
    60×(20-x)=20x
    4.5x²-x+4.5×36=0

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