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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 7/18 // - 7/18
3/n-(7/18) = 0
3/n-7/18 = 0
3*n^-1 = 7/18 // : 3
n^-1 = 7/54
-1 < 0
1/(n^1) = 7/54 // * n^1
1 = 7/54*n^1 // : 7/54
54/7 = n^1
n = 54/7
n = 54/7
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