2 câu trả lời
$@Xà Phòng$
`50x - (x+2).10 = (x+1). 30 - 50x`
`⇔ 50x - (10x + 20) = 30x + 30 - 50x`
`⇔ 50x - 10x - 20 = 30x + 30 - 50x`
`⇔ 50x - 10x - 30x + 50x = 30 + 20`
`⇔ 60x = 50`
`⇔ x = 5/6`
Vậy `S= {5/6}`
$@Xà Phòng$
`50x - (x+2).10 = (x+1). 30 - 50x`
`⇔ 50x - (10x + 20) = 30x + 30 - 50x`
`⇔ 50x - 10x - 20 = 30x + 30 - 50x`
`⇔ 50x - 10x - 30x + 50x = 30 + 20`
`⇔ 60x = 50`
`⇔ x = 5/6`
Vậy `S= {5/6}`