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Ответ:

(х³ + 3х2)+(-4х-12)=0

х²(х + 3)-4(х+3)=0

(х + 3)(х² - 4)=0

х+3=0. х²-4=0

х=-3. (х-2)(х+2)=0

х-2=0. х+2=0

х=2 х=-2

ответ -3