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