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