x-2\2=8\x-2(với x không thuộc 2)

`(x - 2)/2 = 8/(x - 2)` `(ĐK: x \ne 2)`

`=> (x - 2) . (x - 2) = 2 . 8`

`=> (x - 2)^2 = 16`

`=> (x - 2)^2 = (+-4)^2`

`=>` \(\left[ \begin{array}{l}x - 2 = 4\\x - 2 = -4\end{array} \right.\)

`=>` \(\left[ \begin{array}{l}x = 4 + 2\\x = -4 + 2\end{array} \right.\)

`=>` \(\left[ \begin{array}{l}x = 6. (tm)\\x = -2. (tm)\end{array} \right.\) 

`Vậy: x \in {6; -2}`