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4x(x² - 1) = 0 (w nawiasie różnica kwadratów)
4x(x +1)(x - 1) = 0
x = 0 ∨ x + 1 = 0 ∨ x - 1 = 0
x = 0 ∨ x = -1 ∨ x = 1
Gotowe!!!