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