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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
(11/5)*s+12/s = 0
11/5*s^1+12*s^-1 = 0
(11/5*s^2+12*s^0)/(s^1) = 0 // * s^2
s^1*(11/5*s^2+12*s^0) = 0
s^1
(11/5)*s^2+12 = 0
(11/5)*s^2+12 = 0
DELTA = 0^2-(4*12*(11/5))
DELTA = -528/5
DELTA < 0
s in { }
s belongs to the empty set
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