\begin{array}{c|c|c}\color{gainsboro}{𝕻𝖍}\color{lightgrey}{𝖚𝖔}\color{silver}{𝖓𝖌}\color{darkgray}{𝕿𝖍}\color{gray}{𝖆}\color{dimgray}{𝖓}\color{black}{𝖍}\end{array}

`a)` `1/2(x+5)-4=1/3(2x-1)`

`3(x+5)-24=2(2x-1)`

`3x+15-24=4x-2`

`3x-9=4x-2`

`x=-7`

Vậy `S={-7}`

`b)` `x/2-1/5=2-x/3`

`15x-6=60-10x`

`25x=66`

`x=66/25`

Vậy `S={66/25}`