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k in (-oo:+oo)
(3/4)*k-((1/4)*k)-5 = -1 // + 1
(3/4)*k-((1/4)*k)-5+1 = 0
(3/4)*k+(-1/4)*k-5+1 = 0
1/2*k-4 = 0 // + 4
1/2*k = 4 // : 1/2
k = 4/1/2
k = 8
k = 8
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