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D( a )
3-a = 0
3-a = 0
3-a = 0
3-a = 0 // - 3
-a = -3 // * -1
a = 3
a in (-oo:3) U (3:+oo)
(((a-3)*(a-3))/(3-a))*(a+3) = 0
((a-3)^2*(a+3))/(3-a) = 0
( a+3 )
a+3 = 0 // - 3
a = -3
( a-3 )
a-3 = 0 // + 3
a = 3
a in { 3}
a = -3
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