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k in (-oo:+oo)
2/3-((5/6)*k) = 1/14 // - 1/14
2/3-((5/6)*k)-(1/14) = 0
(-5/6)*k+2/3-1/14 = 0
25/42-5/6*k = 0 // - 25/42
-5/6*k = -25/42 // : -5/6
k = -25/42/(-5/6)
k = 5/7
k = 5/7
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