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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
6/4 = 9/N // - 9/N
6/4-(9/N) = 0
6/4-9*N^-1 = 0
-9*N^-1 = -3/2 // : -9
N^-1 = 1/6
-1 < 0
1/(N^1) = 1/6 // * N^1
1 = 1/6*N^1 // : 1/6
6 = N^1
N = 6
N = 6
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