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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/3 = 120/n // - 120/n
5/3-(120/n) = 0
5/3-120*n^-1 = 0
-120*n^-1 = -5/3 // : -120
n^-1 = 1/72
-1 < 0
1/(n^1) = 1/72 // * n^1
1 = 1/72*n^1 // : 1/72
72 = n^1
n = 72
n = 72
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