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