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4x² + 2x + 2x + 1 = 0
2x(2x + 1) + 1(2x + 1) = 0
(2x + 1) (2x + 1) = 0
2x + 1 = 0
2x = -1
x₁ = -1/2
2x + 1 = 0
2x = -1
x₂ = -1/2