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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
3/5 = 20/N // - 20/N
3/5-(20/N) = 0
3/5-20*N^-1 = 0
-20*N^-1 = -3/5 // : -20
N^-1 = 3/100
-1 < 0
1/(N^1) = 3/100 // * N^1
1 = 3/100*N^1 // : 3/100
100/3 = N^1
N = 100/3
N = 100/3
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