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s in (-oo:+oo)
(1/3)*(s+6) = -3 // + 3
(1/3)*(s+6)+3 = 0
1/3*(s+6)+3 = 0
1/3*(s+6)+3 = 0
1/3*s+5 = 0
1/3*s+5 = 0
1/3*s+5 = 0 // - 5
1/3*s = -5 // : 1/3
s = -5/1/3
s = -15
s = -15
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