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k in (-oo:+oo)
(3/4)*k^2-k-(8/3) = 0
(3/4)*k^2-k-8/3 = 0
3/4*k^2-k-8/3 = 0
DELTA = (-1)^2-(-8/3*3/4*4)
DELTA = 9
DELTA > 0
k = (9^(1/2)+1)/(3/4*2) or k = (1-9^(1/2))/(3/4*2)
k = 8/3 or k = -4/3
k in { -4/3, 8/3 }
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