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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/5 = 8/n // - 8/n
12/5-(8/n) = 0
12/5-8*n^-1 = 0
-8*n^-1 = -12/5 // : -8
n^-1 = 3/10
-1 < 0
1/(n^1) = 3/10 // * n^1
1 = 3/10*n^1 // : 3/10
10/3 = n^1
n = 10/3
n = 10/3
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