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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = -9 // + 9
6/n+9 = 0
6*n^-1 = -9 // : 6
n^-1 = -3/2
-1 < 0
1/(n^1) = -3/2 // * n^1
1 = -3/2*n^1 // : -3/2
-2/3 = n^1
n = -2/3
n = -2/3
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