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