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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
60/n = 12 // - 12
60/n-12 = 0
60*n^-1 = 12 // : 60
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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