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k in (-oo:+oo)
(1/2)*k-5 = (1/4)*k-1 // - (1/4)*k-1
(1/2)*k-((1/4)*k)-5+1 = 0
(1/2)*k+(-1/4)*k-5+1 = 0
1/4*k-4 = 0 // + 4
1/4*k = 4 // : 1/4
k = 4/1/4
k = 16
k = 16
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