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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
36/n = 109/18 // - 109/18
36/n-(109/18) = 0
36/n-109/18 = 0
36*n^-1 = 109/18 // : 36
n^-1 = 109/648
-1 < 0
1/(n^1) = 109/648 // * n^1
1 = 109/648*n^1 // : 109/648
648/109 = n^1
n = 648/109
n = 648/109
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