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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 5/9 // - 5/9
8/n-(5/9) = 0
8/n-5/9 = 0
8*n^-1 = 5/9 // : 8
n^-1 = 5/72
-1 < 0
1/(n^1) = 5/72 // * n^1
1 = 5/72*n^1 // : 5/72
72/5 = n^1
n = 72/5
n = 72/5
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