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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14/n = 7/9 // - 7/9
14/n-(7/9) = 0
14/n-7/9 = 0
14*n^-1 = 7/9 // : 14
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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