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D( x )
x-8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
(x-2)/(x-8) = 6/(x-8) // - 6/(x-8)
(x-2)/(x-8)-(6/(x-8)) = 0
(x-2)/(x-8)-6*(x-8)^-1 = 0
(x-2)/(x-8)-6/(x-8) = 0
x-6-2 = 0
x-8 = 0
(x-8)/(x-8) = 0
(x-8)/(x-8) = 0 // * x-8
x-8 = 0
x-8 = 0 // + 8
x = 8
x in { 8}
x belongs to the empty set
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