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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(2/3)*a+4/a+3 = 0
2/3*a^1+4*a^-1+3*a^0 = 0
(2/3*a^2+3*a^1+4*a^0)/(a^1) = 0 // * a^2
a^1*(2/3*a^2+3*a^1+4*a^0) = 0
a^1
(2/3)*a^2+3*a+4 = 0
(2/3)*a^2+3*a+4 = 0
DELTA = 3^2-(4*4*(2/3))
DELTA = -5/3
DELTA < 0
a in { }
a belongs to the empty set
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