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D( a )
a = 0
27*a^-3 = 0
a = 0
a = 0
27*a^-3 = 0
27*a^-3 = 0
27*a^-3 = 0 // : 27
a^-3 = 0
a należy do O
a in (-oo:0) U (0:+oo)
((27*a^-3)^-2)/3 = 0
1/2187*a^6 = 0 // : 1/2187
a^6 = 0
a = 0
a in { 0}
a belongs to the empty set
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