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k in (-oo:+oo)
(5/6)*k+5/7 = (5/7)*k+15/14 // - (5/7)*k+15/14
(5/6)*k-((5/7)*k)+5/7-(15/14) = 0
(5/6)*k+(-5/7)*k+5/7-15/14 = 0
5/42*k-5/14 = 0 // + 5/14
5/42*k = 5/14 // : 5/42
k = 5/14/5/42
k = 3
k = 3
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