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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/4 = 60/n // - 60/n
12/4-(60/n) = 0
12/4-60*n^-1 = 0
-60*n^-1 = -3 // : -60
n^-1 = 1/20
-1 < 0
1/(n^1) = 1/20 // * n^1
1 = 1/20*n^1 // : 1/20
20 = n^1
n = 20
n = 20
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