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k in (-oo:+oo)
(5/6)*k-((4/5)*k)-3 = 1/2 // - 1/2
(5/6)*k-((4/5)*k)-(1/2)-3 = 0
(5/6)*k+(-4/5)*k-1/2-3 = 0
1/30*k-7/2 = 0 // + 7/2
1/30*k = 7/2 // : 1/30
k = 7/2/1/30
k = 105
k = 105
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