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