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