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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
96/n = -8 // + 8
96/n+8 = 0
96*n^-1 = -8 // : 96
n^-1 = -1/12
-1 < 0
1/(n^1) = -1/12 // * n^1
1 = -1/12*n^1 // : -1/12
-12 = n^1
n = -12
n = -12
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