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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/n = (3/5)/18 // - (3/5)/18
15/n-((3/5)/18) = 0
15/n-1/30 = 0
15*n^-1 = 1/30 // : 15
n^-1 = 1/450
-1 < 0
1/(n^1) = 1/450 // * n^1
1 = 1/450*n^1 // : 1/450
450 = n^1
n = 450
n = 450
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