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k in (-oo:+oo)
(3*k^2)/72 = 33*k // - 33*k
(3*k^2)/72-(33*k) = 0
(3*k^2)/72-33*k = 0
1/24*k^2-33*k = 0
DELTA = (-33)^2-(0*1/24*4)
DELTA = 1089
DELTA > 0
k = (1089^(1/2)+33)/(1/24*2) or k = (33-1089^(1/2))/(1/24*2)
k = 792 or k = 0
k in { 0, 792 }
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