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k in (-oo:+oo)
(1/2)*k-((5/6)*k)-7 = 3 // - 3
(1/2)*k-((5/6)*k)-7-3 = 0
(1/2)*k+(-5/6)*k-7-3 = 0
-1/3*k-10 = 0 // + 10
-1/3*k = 10 // : -1/3
k = 10/(-1/3)
k = -30
k = -30
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