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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
36/N = 4 // - 4
36/N-4 = 0
36*N^-1 = 4 // : 36
N^-1 = 1/9
-1 < 0
1/(N^1) = 1/9 // * N^1
1 = 1/9*N^1 // : 1/9
9 = N^1
N = 9
N = 9
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