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    x²-3x+2=0
    (2x-1)²+x²=0
    (x+1)²-x²=0
    (x+1)-x=0
    x²=5
    x2=5
    (120-x)(64+1.6x)=8800
    170x-x²=7200
    x^-1/5
    lgx+3.45=0
    lgx+3.45=0
    lgx=-3.45
    lgx=3.45
    x^2/(0.5-x)=0.000018
    40²+x²=30²+(70-x)²
    -0.44 x^2-3.84x+9.8
    -0.44 x^2-9. 6x+9. 8
    (x-30)(3x-60)=1800
    (x-37)(70-2x)=2590
    (x-1.2)^2+2.56=x^2

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