`5/(x-2)=15/6`

`<=>5.6=15(x-2)`

`<=>30=15x-30`

`<=>15x=30+30`

`<=>15x=60`

`<=>x=60:15`

`<=>x=4`

Vậy `S={4}`

`111111111111111/11111111111111111111111111111+11/11`

`111`

$\dfrac{22222}{2222}$

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