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s in (-oo:+oo)
3*(s+4) = (1/2)*s-8 // - (1/2)*s-8
3*(s+4)-((1/2)*s)+8 = 0
3*(s+4)+(-1/2)*s+8 = 0
3*(s+4)-s/2+8 = 0
(2*3*(s+4))/2-s/2+(2*8)/2 = 0
2*3*(s+4)-s+2*8 = 0
5*s+16+24 = 0
5*s+40 = 0
(5*s+40)/2 = 0
(5*s+40)/2 = 0 // * 2
5*s+40 = 0
5*s+40 = 0 // - 40
5*s = -40 // : 5
s = -40/5
s = -8
s = -8
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