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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(5/1)/4 = 12/n // - 12/n
(5/1)/4-(12/n) = 0
5/4-12*n^-1 = 0
-12*n^-1 = -5/4 // : -12
n^-1 = 5/48
-1 < 0
1/(n^1) = 5/48 // * n^1
1 = 5/48*n^1 // : 5/48
48/5 = n^1
n = 48/5
n = 48/5
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