Câu trả lời:
`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}`
`111`
$\dfrac{22222}{2222}$
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