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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/n = (5/2)/27 // - (5/2)/27
15/n-((5/2)/27) = 0
15/n-5/54 = 0
15*n^-1 = 5/54 // : 15
n^-1 = 1/162
-1 < 0
1/(n^1) = 1/162 // * n^1
1 = 1/162*n^1 // : 1/162
162 = n^1
n = 162
n = 162
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