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