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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
22/n = 6/9 // - 6/9
22/n-(6/9) = 0
22/n-2/3 = 0
22*n^-1 = 2/3 // : 22
n^-1 = 1/33
-1 < 0
1/(n^1) = 1/33 // * n^1
1 = 1/33*n^1 // : 1/33
33 = n^1
n = 33
n = 33
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