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k in (-oo:+oo)
(1/3)*k-((4*((2/3)*k-3)^2)/3)-6 = 0
(-4/3)*((2/3)*k-3)^2+(1/3)*k-6 = 0
k/3-4/3*(2/3*k-3)^2-6 = 0
(-4/3*3*(2/3*k-3)^2)/3+k/3+(-6*3)/3 = 0
k-4/3*3*(2/3*k-3)^2-6*3 = 0
17*k-16/9*k^2-36-18 = 0
17*k-16/9*k^2-54 = 0
17*k-16/9*k^2-54 = 0
17*k-16/9*k^2-54 = 0
DELTA = 17^2-(-54*(-16/9)*4)
DELTA = -95
DELTA < 0
1 = 0
1/3 = 0
1/3 = 0 // * 3
1 = 0
k belongs to the empty set
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