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x² + 2x - 5/2 = 0
x² + 2x = 5/2
x² + 2x + 1 = 1 + 5/2
(x + 1)² = 7/2
x + 1 = √(7/2)
x + 1 = atau x + 1 = -
x = -1 + atau x = - 1 -