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2x² + x = 1
2x² + x - 1 = 0
2x -1
x +1
(2x - 1)(x + 1) = 0
2x - 1 = 0
2x = 1
x = 1/2
x1 = 1/2
x + 1 = 0
x = -1
x2 = -1