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s in (-oo:+oo)
3*(s+4) = 1/2-8 // - 1/2-8
3*(s+4)-(1/2)+8 = 0
3*(s+4)-1/2+8 = 0
(2*3*(s+4))/2-1/2+(2*8)/2 = 0
2*3*(s+4)+2*8-1 = 0
6*s+16+23 = 0
6*s+39 = 0
(6*s+39)/2 = 0
(6*s+39)/2 = 0 // * 2
6*s+39 = 0
6*s+39 = 0 // - 39
6*s = -39 // : 6
s = -39/6
s = -13/2
s = -13/2
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