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