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D( n )
1-n = 0
1-n = 0
1-n = 0
1-n = 0 // - 1
-n = -1 // * -1
n = 1
n in (-oo:1) U (1:+oo)
(3*n-5)/(1-n) = 0
3*n-5 = 0 // + 5
3*n = 5 // : 3
n = 5/3
n = 5/3
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