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D( n )
n-8 = 0
n+6 = 0
n-8 = 0
n-8 = 0
n-8 = 0 // + 8
n = 8
n+6 = 0
n+6 = 0
n+6 = 0 // - 6
n = -6
n in (-oo:-6) U (-6:8) U (8:+oo)
5/(n+6) = 3/(n-8) // - 3/(n-8)
5/(n+6)-(3/(n-8)) = 0
5/(n+6)-3*(n-8)^-1 = 0
5/(n+6)-3/(n-8) = 0
(5*(n-8))/((n+6)*(n-8))+(-3*(n+6))/((n+6)*(n-8)) = 0
5*(n-8)-3*(n+6) = 0
2*n-58 = 0
(2*n-58)/((n+6)*(n-8)) = 0
(2*n-58)/((n+6)*(n-8)) = 0 // * (n+6)*(n-8)
2*n-58 = 0
2*n-58 = 0 // + 58
2*n = 58 // : 2
n = 58/2
n = 29
n = 29
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