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k in (-oo:+oo)
-k-(1/6) = 5/6-(3*k) // - 5/6-(3*k)
3*k-k-(1/6)-(5/6) = 0
3*k-k-1/6-5/6 = 0
2*k-1 = 0 // + 1
2*k = 1 // : 2
k = 1/2
k = 1/2
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