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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n+5/n-3+5 = 0
10*n^-1 = -2 // : 10
n^-1 = -1/5
-1 < 0
1/(n^1) = -1/5 // * n^1
1 = -1/5*n^1 // : -1/5
-5 = n^1
n = -5
n = -5
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