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