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k in (-oo:+oo)
(5/6)*k+2 = 7/6 // - 7/6
(5/6)*k-(7/6)+2 = 0
(5/6)*k-7/6+2 = 0
5/6*k+5/6 = 0 // - 5/6
5/6*k = -5/6 // : 5/6
k = -5/6/5/6
k = -1
k = -1
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