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4x2 - 20x + 25 = 0
(4x)2 -20(4x) + 100 = 0
(4x - 10 ) (4x - 10) = 0 /2x2
(2x - 5 ) (2x - 5) = 0
(2x - 5) = 0 / (2x - 5) = 0
2x = 5 / 2x = 5
x1 = 5/2 ; x2 = 5/2