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