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D( a )
8*a^-3 = 0
a = 0
8*a^-3 = 0
8*a^-3 = 0
8*a^-3 = 0 // : 8
a^-3 = 0
a naleu017Cy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
((8*a^-3)^-2)/3 = 0
1/192*a^6 = 0 // : 1/192
a^6 = 0
a = 0
a in { 0}
a belongs to the empty set
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