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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6*a+24/a+4 = 0
6*a^1+24*a^-1+4*a^0 = 0
(6*a^2+4*a^1+24*a^0)/(a^1) = 0 // * a^2
a^1*(6*a^2+4*a^1+24*a^0) = 0
a^1
6*a^2+4*a+24 = 0
6*a^2+4*a+24 = 0
DELTA = 4^2-(4*6*24)
DELTA = -560
DELTA < 0
a in { }
a belongs to the empty set
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