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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 9/10 // - 9/10
2/n-(9/10) = 0
2/n-9/10 = 0
2*n^-1 = 9/10 // : 2
n^-1 = 9/20
-1 < 0
1/(n^1) = 9/20 // * n^1
1 = 9/20*n^1 // : 9/20
20/9 = n^1
n = 20/9
n = 20/9
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