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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4-(10/a) = 4*a+3 // - 4*a+3
4-(4*a)-(10/a)-3 = 0
4-4*a-10*a^-1-3 = 0
1*a^0-4*a^1-10*a^-1 = 0
(1*a^1-4*a^2-10*a^0)/(a^1) = 0 // * a^2
a^1*(1*a^1-4*a^2-10*a^0) = 0
a^1
a-4*a^2-10 = 0
a-4*a^2-10 = 0
DELTA = 1^2-(-10*(-4)*4)
DELTA = -159
DELTA < 0
a in { }
a belongs to the empty set
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