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4x² -4x + 1 =0
(2x-1)(2x-1)=0
2x-1 =0
2x=1
x=½
(x - 1/2)² = 0
x² - 1x + ¼ = 0
x² - x + ¼ = 0
(x - 1/2)² = 0
x - 1/2 = 0
x =1/2
(x =0,5
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