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D( a )
2*a-4 = 0
2*a-4 = 0
2*a-4 = 0
2*a-4 = 0 // + 4
2*a = 4 // : 2
a = 4/2
a = 2
a in (-oo:2) U (2:+oo)
(3*a-6)/(2*a-4) = 0
3*a-6 = 0 // + 6
3*a = 6 // : 3
a = 6/3
a = 2
a in { 2}
a belongs to the empty set
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