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Ответ:

х^2-4х+4+24=4+12х+9х^2

х^2-4х+24=12х+9х^2

х^2-4х+24-12х-9х^2=0

-8х^2-16х+24=0

х^2+2х-3=0

х^2+3х-х=0

х(х+3)-(х+3)=0

(х+3)(х-1)=0

х+3=0 х=-3

х-1=0 х=1