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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n = 9/5 // - 9/5
7/n-(9/5) = 0
7/n-9/5 = 0
7*n^-1 = 9/5 // : 7
n^-1 = 9/35
-1 < 0
1/(n^1) = 9/35 // * n^1
1 = 9/35*n^1 // : 9/35
35/9 = n^1
n = 35/9
n = 35/9
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