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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a/6+4/a-(a/a)-4+4 = 0
a/6+4/a-4-1+4 = 0
1/6*a^1+4*a^-1-1*a^0 = 0
(1/6*a^2-1*a^1+4*a^0)/(a^1) = 0 // * a^2
a^1*(1/6*a^2-1*a^1+4*a^0) = 0
a^1
(1/6)*a^2-a+4 = 0
(1/6)*a^2-a+4 = 0
DELTA = (-1)^2-(4*4*(1/6))
DELTA = -5/3
DELTA < 0
a in { }
a belongs to the empty set
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