Ответ:
x² - 1 = 0
(x - 1)(x+1)=0
x = 1
x = -1
ИЛИ
x² = 1
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Ответ:
x² - 1 = 0
(x - 1)(x+1)=0
x = 1
x = -1
ИЛИ
x² - 1 = 0
x² = 1
x = 1
x = -1