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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/8 = (11/8)/n // - (11/8)/n
1/8-((11/8)/n) = 0
(-11/8)*n^-1+1/8 = 0
-11/8*n^-1 = -1/8 // : -11/8
n^-1 = 1/11
-1 < 0
1/(n^1) = 1/11 // * n^1
1 = 1/11*n^1 // : 1/11
11 = n^1
n = 11
n = 11
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