Tìm x X . 2/7= 2/3 X- 5/6=2/3:1/2

`a,` `x. 2/7 = 2/3`

`x = 2/3 : 2/7`

`x = 2/3 . 7/2`

`x = 7/3` 

Vậy `x = 7/3`

`b`, `x -5/6 = 2/3 : 1/2`

` x - 5/6 = 2/3 . 2` 

`x - 5/6 = 4/3` 

` x- 5/6 = 8/6` 

`x = 8/6 + 5/6` 

` x = 13/6` 

Vậy `x = 13/6`