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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-18/n = 9/2 // - 9/2
-18/n-(9/2) = 0
-18/n-9/2 = 0
-18*n^-1 = 9/2 // : -18
n^-1 = -1/4
-1 < 0
1/(n^1) = -1/4 // * n^1
1 = -1/4*n^1 // : -1/4
-4 = n^1
n = -4
n = -4
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