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