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k in (-oo:+oo)
(1/6)*k-((5/6)*k)-1/6 = -11/2 // + -11/2
(1/6)*k-((5/6)*k)-1/6-(-11/2) = 0
(1/6)*k+(-5/6)*k-1/6+11/2 = 0
16/3-2/3*k = 0 // - 16/3
-2/3*k = -16/3 // : -2/3
k = -16/3/(-2/3)
k = 8
k = 8
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