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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) = 4/2 // - 4/2
(n-8)/(5*n-2)-(4/2) = 0
(n-8)/(5*n-2)-2 = 0
(n-8)/(5*n-2)+(-2*(5*n-2))/(5*n-2) = 0
n-2*(5*n-2)-8 = 0
-9*n-4 = 0
(-9*n-4)/(5*n-2) = 0
(-9*n-4)/(5*n-2) = 0 // * 5*n-2
-9*n-4 = 0
-9*n-4 = 0 // + 4
-9*n = 4 // : -9
n = 4/(-9)
n = -4/9
n = -4/9
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