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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(3/2)/(6/4) = 18/n // - 18/n
(3/2)/(6/4)-(18/n) = 0
(3/2)/(6/4)-18*n^-1 = 0
-18*n^-1 = -1 // : -18
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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