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k in (-oo:+oo)
(2/3)*k-1 = 5/6 // - 5/6
(2/3)*k-(5/6)-1 = 0
(2/3)*k-5/6-1 = 0
2/3*k-11/6 = 0 // + 11/6
2/3*k = 11/6 // : 2/3
k = 11/6/2/3
k = 11/4
k = 11/4
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