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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-15/n = -3 // + 3
3-15/n = 0
-15*n^-1 = -3 // : -15
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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