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D( n )
n+8 = 0
n+8 = 0
n+8 = 0
n+8 = 0 // - 8
n = -8
n in (-oo:-8) U (-8:+oo)
(9*n)/(n+8)-10 = (6*n)/(n+8) // - (6*n)/(n+8)
(9*n)/(n+8)-((6*n)/(n+8))-10 = 0
(9*n)/(n+8)-6*n*(n+8)^-1-10 = 0
(9*n)/(n+8)+(-6*n)/(n+8)-10 = 0
(9*n)/(n+8)+(-6*n)/(n+8)+(-10*(n+8))/(n+8) = 0
9*n-10*(n+8)-6*n = 0
3*n-10*n-80 = 0
-7*n-80 = 0
(-7*n-80)/(n+8) = 0
(-7*n-80)/(n+8) = 0 // * n+8
-7*n-80 = 0
-7*n-80 = 0 // + 80
-7*n = 80 // : -7
n = 80/(-7)
n = -80/7
n = -80/7
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