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k in (-oo:+oo)
(1/6)*(3*k+6) = 3-(3*k) // - 3-(3*k)
(1/6)*(3*k+6)+3*k-3 = 0
1/6*(3*k+6)+3*k-3 = 0
1/6*(3*k+6)+3*k-3 = 0
7/2*k-3+1 = 0
7/2*k-2 = 0
7/2*k-2 = 0
7/2*k-2 = 0 // + 2
7/2*k = 2 // : 7/2
k = 2/7/2
k = 4/7
k = 4/7
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