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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
4/N = -8 // + 8
4/N+8 = 0
4*N^-1 = -8 // : 4
N^-1 = -2
-1 < 0
1/(N^1) = -2 // * N^1
1 = -2*N^1 // : -2
-1/2 = N^1
N = -1/2
N = -1/2
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