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k in (-oo:+oo)
0 = 9*(k-(2/3))+33 // - 9*(k-(2/3))+33
0-(9*(k-(2/3)))-33 = 0
-9*(k-2/3)-33 = 0
-9*(k-2/3)-33 = 0
-9*k-27 = 0
-9*k-27 = 0
-9*k-27 = 0 // + 27
-9*k = 27 // : -9
k = 27/(-9)
k = -3
k = -3
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