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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
b/2+3/b = 0
1/2*b^1+3*b^-1 = 0
(1/2*b^2+3*b^0)/(b^1) = 0 // * b^2
b^1*(1/2*b^2+3*b^0) = 0
b^1
(1/2)*b^2+3 = 0
(1/2)*b^2+3 = 0
DELTA = 0^2-(3*4*(1/2))
DELTA = -6
DELTA < 0
b in { }
b belongs to the empty set
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