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D( n )
n+3 = 0
5*n-9 = 0
n+3 = 0
n+3 = 0
n+3 = 0 // - 3
n = -3
5*n-9 = 0
5*n-9 = 0
5*n-9 = 0 // + 9
5*n = 9 // : 5
n = 9/5
n in (-oo:-3) U (-3:9/5) U (9/5:+oo)
2/(n+3) = -5/(5*n-9) // + -5/(5*n-9)
2/(n+3)-(-5/(5*n-9)) = 0
2/(n+3)+5*(5*n-9)^-1 = 0
2/(n+3)+5/(5*n-9) = 0
(2*(5*n-9))/((n+3)*(5*n-9))+(5*(n+3))/((n+3)*(5*n-9)) = 0
2*(5*n-9)+5*(n+3) = 0
15*n-3 = 0
(15*n-3)/((n+3)*(5*n-9)) = 0
(15*n-3)/((n+3)*(5*n-9)) = 0 // * (n+3)*(5*n-9)
15*n-3 = 0
15*n-3 = 0 // + 3
15*n = 3 // : 15
n = 3/15
n = 1/5
n = 1/5
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