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    -2/3*(m-2)(m-6)=2m-8
    1/lnx
    1.6x-5ln((6-x)/6)=0.15
    -arctan(x)-arctan(x/2)-arctan(x/3)=π/2
    0.00012996+0.0456x+4x²=0.0004322747-0.130758x+7.03x²
    2/3*(m-6)(m-2)=2m-8
    4=(4÷3k)(4÷3k)+(3-4÷(3k×k)(3-4÷(3k×k)
    4=(4÷3k)(4÷3k)+(3-4÷3k×k)(3-4÷3k×k)
    4=(4÷3k)(4÷3k)+(3-4÷3k×3k)(3-4÷3k×3k)
    4+2.5k×k=3k
    x×x/(1-x)/(1-x)=1.39
    x×x/(1-x)×(1-x)=1.39
    125000000=9.6×250×(460-0.5x)x
    125000000=9.6×250×(460-0.5x)
    2x = 7+4x
    2 / x =7 / x
    (6000-x)÷10×5-10x = 2475
    56-5x=61
    -x²+680x-10890=0
    X²-75x+350=0

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