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D( n )
5*n-2 = 0
5*n-2 = 0
5*n-2 = 0
5*n-2 = 0 // + 2
5*n = 2 // : 5
n = 2/5
n in (-oo:2/5) U (2/5:+oo)
(n+8)/(5*n-2) = 3/8 // - 3/8
(n+8)/(5*n-2)-(3/8) = 0
(n+8)/(5*n-2)-3/8 = 0
(8*(n+8))/(8*(5*n-2))+(-3*(5*n-2))/(8*(5*n-2)) = 0
8*(n+8)-3*(5*n-2) = 0
70-7*n = 0
(70-7*n)/(8*(5*n-2)) = 0
(70-7*n)/(8*(5*n-2)) = 0 // * 8*(5*n-2)
70-7*n = 0
70-7*n = 0 // - 70
-7*n = -70 // : -7
n = -70/(-7)
n = 10
n = 10
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