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D( n )
9*n = 0
9*n = 0
9*n = 0
9*n = 0 // : 9
n = 0
n in (-oo:0) U (0:+oo)
(9*n+2)/(9*n) = 0
9*n+2 = 0 // - 2
9*n = -2 // : 9
n = -2/9
n = -2/9
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