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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-18/10 = -11/n // + -11/n
-(-11/n)-18/10 = 0
11*n^-1-18/10 = 0
11*n^-1 = 9/5 // : 11
n^-1 = 9/55
-1 < 0
1/(n^1) = 9/55 // * n^1
1 = 9/55*n^1 // : 9/55
55/9 = n^1
n = 55/9
n = 55/9
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