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k in (-oo:+oo)
5*k = 1/6 // - 1/6
5*k-(1/6) = 0
5*k-1/6 = 0
5*k-1/6 = 0 // + 1/6
5*k = 1/6 // : 5
k = 1/6/5
k = 1/30
k = 1/30
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