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k in (-oo:+oo)
(5/4)*k = 1/2 // - 1/2
(5/4)*k-(1/2) = 0
(5/4)*k-1/2 = 0
5/4*k-1/2 = 0 // + 1/2
5/4*k = 1/2 // : 5/4
k = 1/2/5/4
k = 2/5
k = 2/5
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