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