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D( k )
3-(3*k) = 0
3-(3*k) = 0
3-(3*k) = 0
3-3*k = 0
3-3*k = 0 // - 3
-3*k = -3 // : -3
k = -3/(-3)
k = 1
k in (-oo:1) U (1:+oo)
-((1-k)/(3-(3*k))) = 0
-((1-k)/(3-3*k)) = 0
(-1*(1-k))/(3-3*k) = 0
1-k = 0 // - 1
-k = -1 // * -1
k = 1
k in { 1}
k belongs to the empty set
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