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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-15/n = 9 // - 9
-15/n-9 = 0
-15*n^-1 = 9 // : -15
n^-1 = -3/5
-1 < 0
1/(n^1) = -3/5 // * n^1
1 = -3/5*n^1 // : -3/5
-5/3 = n^1
n = -5/3
n = -5/3
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