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D( n )
n+2 = 0
n+2 = 0
n+2 = 0
n+2 = 0 // - 2
n = -2
n in (-oo:-2) U (-2:+oo)
(3*n-17)/(n+2) = 0
3*n-17 = 0 // + 17
3*n = 17 // : 3
n = 17/3
n = 17/3
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