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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
1/N = 10/50 // - 10/50
1/N-(10/50) = 0
1/N-1/5 = 0
1*N^-1 = 1/5 // : 1
N^-1 = 1/5
-1 < 0
1/(N^1) = 1/5 // * N^1
1 = 1/5*N^1 // : 1/5
5 = N^1
N = 5
N = 5
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