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k in (-oo:+oo)
(-1/4)*(-k-1) = 5/4-((23*k)/4) // - 5/4-((23*k)/4)
(-1/4)*(-k-1)+(23*k)/4-(5/4) = 0
(-1/4)*(-k-1)+(23*k)/4-5/4 = 0
(23*k)/4-1/4*(-k-1)-5/4 = 0
(-1/4*4*(-k-1))/4+(23*k)/4-5/4 = 0
23*k-1/4*4*(-k-1)-5 = 0
24*k-5+1 = 0
24*k-4 = 0
(24*k-4)/4 = 0
(24*k-4)/4 = 0 // * 4
24*k-4 = 0
24*k-4 = 0 // + 4
24*k = 4 // : 24
k = 4/24
k = 1/6
k = 1/6
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