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k in (-oo:+oo)
(3/3)*k-(((4*k)/3)*k)+12 = 0
(-4/3)*k^2+(3/3)*k+12 = 0
k-4/3*k^2+12 = 0
DELTA = 1^2-(-4/3*4*12)
DELTA = 65
DELTA > 0
k = (65^(1/2)-1)/(-4/3*2) or k = (-65^(1/2)-1)/(-4/3*2)
k = -3/8*(65^(1/2)-1) or k = 3/8*(65^(1/2)+1)
k in { -3/8*(65^(1/2)-1), 3/8*(65^(1/2)+1) }
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