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k in (-oo:+oo)
(5*k-(1/2))^2 = 0
(5*k-1/2)^2 = 0
5*k-1/2 = 0 // + 1/2
5*k = 1/2 // : 5
k = 1/2/5
k = 1/10
k in { 1/10, 1/10 }
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