Log4 x + log4 (x-12) = 3

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  1. Enid
    log4 (x+12) + log4x=3

    log4 (x (x+12)) = 3

    log4 (x^2+12x) = 3

    4^3=x^2+12x

    64=x^2+12x

    x^2+12x-64=0

    (x+16) (x-4) = 0

    x=4
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