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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
-192/N = 16 // - 16
-192/N-16 = 0
-192*N^-1 = 16 // : -192
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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