Ответы на вопрос:
а) (x-1)(x+1) - x(x-2) = 0
x² - 1 - x² + 2x = 0
-1 + 2x = 0
2x = 1
x = 0,5
б) (3x+1)²-9(x+1)(x-1) = 0
9x²+6x+1 - 9(x²-1) = 0
9x²+6x+1-9x²+9 = 0
6x + 10 = 0
6x = -10
x = -10/6 = -1 4/6 = -1 2/3
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