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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/a-(3/a) = 0
9/a-3*a^-1 = 0
6*a^-1 = 0 // : 6
a^-1 = 0
a należy do O
a belongs to the empty set
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