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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 18 // - 18
6/n-18 = 0
6*n^-1 = 18 // : 6
n^-1 = 3
-1 < 0
1/(n^1) = 3 // * n^1
1 = 3*n^1 // : 3
1/3 = n^1
n = 1/3
n = 1/3
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