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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
9/3 = 18/n // - 18/n
9/3-(18/n) = 0
9/3-18*n^-1 = 0
-18*n^-1 = -3 // : -18
n^-1 = 1/6
-1 < 0
1/(n^1) = 1/6 // * n^1
1 = 1/6*n^1 // : 1/6
6 = n^1
n = 6
n = 6
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