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