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