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[ √((1-2x)^2) / (4(2x-1)) ]^2 = (1/4)^2
((1-2x)^2) / (4(2x-1)) = 1/16 |*4
((1-2x)^2) / (2x-1) = 1/4
(-(1-2x)^2) / (1-2x) = 1/4
-(1-2x) = 1/4
2x -1 = 1/4
2x = 5/4
x = 5/8