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(x - 1)*(x - 1) = ((x + 1)*(x + 1)
(x - 1)^2 = (x + 1)^2
x^2 - 2x + 1 = x^2 + 2x + 1
-2x + 1 = 2x + 1
-2x - 2x = 1 - 1
-4x = 0
x = 0 -------- odpowiedź