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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-7/n = 15 // - 15
-7/n-15 = 0
-7*n^-1 = 15 // : -7
n^-1 = -15/7
-1 < 0
1/(n^1) = -15/7 // * n^1
1 = -15/7*n^1 // : -15/7
-7/15 = n^1
n = -7/15
n = -7/15
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