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k in (-oo:+oo)
0 = 9*(k-(2/3))+3 // - 9*(k-(2/3))+3
0-(9*(k-(2/3)))-3 = 0
-9*(k-2/3)-3 = 0
-9*(k-2/3)-3 = 0
3-9*k = 0
3-9*k = 0
3-9*k = 0 // - 3
-9*k = -3 // : -9
k = -3/(-9)
k = 1/3
k = 1/3
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