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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
-3*k^2-33 = 0
-3*k^2 = 33 // : -3
k^2 = -11
k belongs to the empty set
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