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