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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
47/n = 36/54 // - 36/54
47/n-(36/54) = 0
47/n-2/3 = 0
47*n^-1 = 2/3 // : 47
n^-1 = 2/141
-1 < 0
1/(n^1) = 2/141 // * n^1
1 = 2/141*n^1 // : 2/141
141/2 = n^1
n = 141/2
n = 141/2
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