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