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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
20/5 = 240/N // - 240/N
20/5-(240/N) = 0
20/5-240*N^-1 = 0
-240*N^-1 = -4 // : -240
N^-1 = 1/60
-1 < 0
1/(N^1) = 1/60 // * N^1
1 = 1/60*N^1 // : 1/60
60 = N^1
N = 60
N = 60
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