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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
9/n = 0.18 // - 0.18
9/n-0.18 = 0
9*n^-1 = 0.18 // : 9
n^-1 = 0.02
-1 < 0
1/(n^1) = 0.02 // * n^1
1 = 0.02*n^1 // : 0.02
50 = n^1
n = 50
n = 50
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