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D( n )
n-4 = 0
n-4 = 0
n-4 = 0
n-4 = 0 // + 4
n = 4
n in (-oo:4) U (4:+oo)
(6*n-10)/(n-4) = 0
6*n-10 = 0 // + 10
6*n = 10 // : 6
n = 10/6
n = 5/3
n = 5/3
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