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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
3/8 = 15/N // - 15/N
3/8-(15/N) = 0
3/8-15*N^-1 = 0
-15*N^-1 = -3/8 // : -15
N^-1 = 1/40
-1 < 0
1/(N^1) = 1/40 // * N^1
1 = 1/40*N^1 // : 1/40
40 = N^1
N = 40
N = 40
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