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k in (-oo:+oo)
(5/6)*k-(1/2) = 1/7 // - 1/7
(5/6)*k-(1/2)-(1/7) = 0
(5/6)*k-1/2-1/7 = 0
5/6*k-9/14 = 0 // + 9/14
5/6*k = 9/14 // : 5/6
k = 9/14/5/6
k = 27/35
k = 27/35
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