`DKXD: 2x-1>0<=>x>1/2`

`log_(1/2)(2x-1)=0`

`2x-1=(1/2)^0`

`2x-1=1`

`2x=2`

`x=1` (TMDK)

Vậy `S={1}`

_-------------_

`*** log_a(b)=c<=>b=a^c`

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