Ответы на вопрос:
(x+ 3) (x^2 - 8x + 7) - 7(x+3) = 0 (x+ 3) (x^2 - 8x + 7 - 7) = 0 (x+3) (x^2 - 8x) = 0 (x + 3) x( x - 8) = 0 x +3 = 0 x = - 3 x = 0 x - 8 = 0 x = 8 ответ: 5
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