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x² + 2x - 3 = 0
x² + 2x - 3 + 1 - 1 = 0
(x² + 2x + 1) - 3 - 1 = 0
(x + 1)² - 4 = 0
(x + 1)² = 4
x + 1 = + 2
x = 2 -1 atau x = -2 -1
x = 1 x = -3