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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
8/2 = 12/N // - 12/N
8/2-(12/N) = 0
8/2-12*N^-1 = 0
-12*N^-1 = -4 // : -12
N^-1 = 1/3
-1 < 0
1/(N^1) = 1/3 // * N^1
1 = 1/3*N^1 // : 1/3
3 = N^1
N = 3
N = 3
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