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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
27/n = 10/n // - 10/n
27/n-(10/n) = 0
27/n-10*n^-1 = 0
17*n^-1 = 0 // : 17
n^-1 = 0
n należy do O
n belongs to the empty set
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