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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)
(15*n+12+24)/(n+2) = 16 // - 16
(15*n+12+24)/(n+2)-16 = 0
(15*n+36)/(n+2)-16 = 0
(15*n+36)/(n+2)+(-16*(n+2))/(n+2) = 0
15*n-16*(n+2)+36 = 0
4-n = 0
(4-n)/(n+2) = 0
(4-n)/(n+2) = 0 // * n+2
4-n = 0
4-n = 0 // - 4
-n = -4 // * -1
n = 4
n = 4
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