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k in (-oo:+oo)
5*k = 1/3 // - 1/3
5*k-(1/3) = 0
5*k-1/3 = 0
5*k-1/3 = 0 // + 1/3
5*k = 1/3 // : 5
k = 1/3/5
k = 1/15
k = 1/15
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