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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 9/(6/5) // - 9/(6/5)
4/n-(9/(6/5)) = 0
4/n-15/2 = 0
4*n^-1 = 15/2 // : 4
n^-1 = 15/8
-1 < 0
1/(n^1) = 15/8 // * n^1
1 = 15/8*n^1 // : 15/8
8/15 = n^1
n = 8/15
n = 8/15
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