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((1/4)*x-(2/5))^2 = 0
((1/4)*x-2/5)^2 = 0
(1/4*x-2/5)^2 = 0
1/4*x-2/5 = 0 // + 2/5
1/4*x = 2/5 // : 1/4
x = 2/5/1/4
x = 8/5
x in { 8/5, 8/5 }
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