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k in (-oo:+oo)
(3*k-4)/6 = 4-k // - 4-k
(3*k-4)/6+k-4 = 0
(3*k-4)/6+(6*k)/6+(-4*6)/6 = 0
3*k+6*k-4*6-4 = 0
9*k-24-4 = 0
9*k-28 = 0
(9*k-28)/6 = 0
(9*k-28)/6 = 0 // * 6
9*k-28 = 0
9*k-28 = 0 // + 28
9*k = 28 // : 9
k = 28/9
k = 28/9
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