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D( a )
a = 0
a^-1 = 0
a = 0
a = 0
a^-1 = 0
a^-1 = 0
1*a^-1 = 0 // : 1
a^-1 = 0
a należy do O
a in (-oo:0) U (0:+oo)
((((3*a^2)/3)/(a^-1))/2)^3 = 0
1/8*a^9 = 0 // : 1/8
a^9 = 0
a = 0
a in { 0}
a belongs to the empty set
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