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D( a )
(2*a)^-3 = 0
2*a = 0
a = 0
(2*a)^-3 = 0
(2*a)^-3 = 0
1/8*a^-3 = 0 // : 1/8
a^-3 = 0
a naleu017Cy do O
2*a = 0
2*a = 0
2*a = 0 // : 2
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(2*a^-2)/((2*a)^-3) = 0
16*a = 0 // : 16
a = 0
a in { 0}
a belongs to the empty set
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