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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
36/11 = 7/n // - 7/n
36/11-(7/n) = 0
36/11-7*n^-1 = 0
-7*n^-1 = -36/11 // : -7
n^-1 = 36/77
-1 < 0
1/(n^1) = 36/77 // * n^1
1 = 36/77*n^1 // : 36/77
77/36 = n^1
n = 77/36
n = 77/36
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