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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)
(6-n)/(n-8) = -3 // + 3
(6-n)/(n-8)+3 = 0
(6-n)/(n-8)+(3*(n-8))/(n-8) = 0
3*(n-8)-n+6 = 0
2*n-18 = 0
(2*n-18)/(n-8) = 0
(2*n-18)/(n-8) = 0 // * n-8
2*n-18 = 0
2*n-18 = 0 // + 18
2*n = 18 // : 2
n = 18/2
n = 9
n = 9
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