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Verified answer

Ответ:

(х+4)^2-7х=(х+1)(х-3)

х^2+8х+16-7х=х^2-2х-3

х+16=-2х-3

3х=-19

х=-19/3

15)

16х^2-25=0

(4х-5)(4х+5)=0

х1=5/4

х2=-5/4