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D( s )
3*s+6 = 0
2*s+4 = 0
3*s+6 = 0
3*s+6 = 0
3*s+6 = 0 // - 6
3*s = -6 // : 3
s = -6/3
s = -2
2*s+4 = 0
2*s+4 = 0
2*s+4 = 0 // - 4
2*s = -4 // : 2
s = -4/2
s = -2
s in (-oo:-2) U (-2:+oo)
1/3-((s-2)/(2*s+4)) = (s+2)/(3*s+6) // - (s+2)/(3*s+6)
1/3-((s-2)/(2*s+4))-((s+2)/(3*s+6)) = 0
(-1*(s-2))/(2*s+4)+(-1*(s+2))/(3*s+6)+1/3 = 0
(-1*3*(s-2)*(3*s+6))/(3*(2*s+4)*(3*s+6))+(-1*3*(s+2)*(2*s+4))/(3*(2*s+4)*(3*s+6))+(1*(2*s+4)*(3*s+6))/(3*(2*s+4)*(3*s+6)) = 0
1*(2*s+4)*(3*s+6)-1*3*(s-2)*(3*s+6)-1*3*(s+2)*(2*s+4) = 0
6*s^2-15*s^2-24*s+24*s+12+24 = 0
36-9*s^2 = 0
(36-9*s^2)/(3*(2*s+4)*(3*s+6)) = 0
(36-9*s^2)/(3*(2*s+4)*(3*s+6)) = 0 // * 3*(2*s+4)*(3*s+6)
36-9*s^2 = 0
-9*s^2 = -36 // : -9
s^2 = 4
s^2 = 4 // ^ 1/2
abs(s) = 2
s = 2 or s = -2
s in { -2}
s = 2
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