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k in (-oo:+oo)
(5/6)*k-((1/3)*k)+10 = 15/2 // - 15/2
(5/6)*k-((1/3)*k)-(15/2)+10 = 0
(5/6)*k+(-1/3)*k-15/2+10 = 0
1/2*k+5/2 = 0 // - 5/2
1/2*k = -5/2 // : 1/2
k = -5/2/1/2
k = -5
k = -5
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