2 câu trả lời
`3/4x-2/3x=7/12`
`⇔(3/4-2/3).x= 7/12`
`⇔1/12.x=7/12`
`⇔x=7/12:1/12`
`⇔x=7/12 . 12/1`
`⇔x=84/12=7`
`=>`Vậy `x=7`
`3/4 x - 2/3 x = 7/12`
`=> ( 3/4 - 2/3 )x = 7/12`
`=> 1/12 x = 7/12`
`=> x = 7/12 : 1/12`
`=> x = 7`
$Vậy$ `x = 7`