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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/n+23/4 = 0
1*n^-1 = -23/4 // : 1
n^-1 = -23/4
-1 < 0
1/(n^1) = -23/4 // * n^1
1 = -23/4*n^1 // : -23/4
-4/23 = n^1
n = -4/23
n = -4/23
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