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k in (-oo:+oo)
49/9 = 3*k-((5/6)*k)+4 // - 3*k-((5/6)*k)+4
(5/6)*k-(3*k)+49/9-4 = 0
(5/6)*k-3*k+49/9-4 = 0
13/9-13/6*k = 0 // - 13/9
-13/6*k = -13/9 // : -13/6
k = -13/9/(-13/6)
k = 2/3
k = 2/3
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