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k in (-oo:+oo)
(((4/16)*k)/4)*k+k-((5/4)*k) = 0
(((4/16)*k)/4)*k+k+(-5/4)*k = 0
1/16*k^2-1/4*k = 0
DELTA = (-1/4)^2-(0*1/16*4)
DELTA = 1/16
DELTA > 0
k = ((1/16)^(1/2)+1/4)/(1/16*2) or k = (1/4-(1/16)^(1/2))/(1/16*2)
k = 4 or k = 0
k in { 0, 4 }
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