Mathematics
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    0.55x+0.6(500-x)=290.5
    m^2+1-2m
    x(x-2)=4
    x(x-2)=4
    x^2-2x=4
    x^2-2x=4
    4x^2-7x-9=0
    2x^2-7x-9=0
    3x^2+10x+5=0
    3x^2+10x+5=0
    1+z^(-1)-z^(-2)
    25/x = 35/(x+20)
    1-z^(-1)+z^(-2)
    25/x=35/x+20
    (4-2/3x)^2+x^2=(6√10/5)^2
    4-2=x
    xe^x-2e^x-1=0
    X+0.442X=86930
    3(10+x)=√3(30+x)
    3n^2-31n+70=0

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