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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12-(8/n) = -1 // + 1
1-(8/n)+12 = 0
1-8*n^-1+12 = 0
-8*n^-1 = -13 // : -8
n^-1 = 13/8
-1 < 0
1/(n^1) = 13/8 // * n^1
1 = 13/8*n^1 // : 13/8
8/13 = n^1
n = 8/13
n = 8/13
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