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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
4/N+6 = 16 // - 16
4/N-16+6 = 0
4*N^-1 = 10 // : 4
N^-1 = 5/2
-1 < 0
1/(N^1) = 5/2 // * N^1
1 = 5/2*N^1 // : 5/2
2/5 = N^1
N = 2/5
N = 2/5
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