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k in (-oo:+oo)
(3/4)*k-((1/4)*k)-5-1 = 0
(3/4)*k+(-1/4)*k-5-1 = 0
1/2*k-6 = 0 // + 6
1/2*k = 6 // : 1/2
k = 6/1/2
k = 12
k = 12
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