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D( a )
3/a = 0
a = 0
3/a = 0
3/a = 0
3*a^-1 = 0 // : 3
a^-1 = 0
a naleu017Cy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(3/a)^-4 = 0
1/81*a^4 = 0 // : 1/81
a^4 = 0
a = 0
a in { 0}
a belongs to the empty set
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