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