Tìm, x giúp mình 2 bài này vs ạ

`c)` `x - 25%x = 1/2`

`⇒ x . ( 1 - 25% ) = 1/2`

`⇒ x . 3/4 = 1/2`

`⇒ x = 1/2 : 3/4`

`⇒ x = 2/3`

`\text{Vậy}` `x = 2/3`

_________________________________________________________________

`d)` `(-5)/6 + 8/3 + (-29)/6 <= x <= (-1)/2 + 2 + 5/2 ( x ∈ Z )`

`⇒ (-5)/6 + 16/6 + (-29)/6 <= x <= (-1)/2 + 4/2 + 5/2`

`⇒` `(-5+16+ (-29))/6 <= x <= (-1+4+5)/2`

`⇒ (-18)/6 <= x <= 8/2`

`⇒ -3 <= x <= 4`

`\text{Vì}` `x ∈ Z ⇒ x ∈ { -3 ; -2 ; -1 ; 0 ; 1 ; 2 ; 3 ; 4 }`

`\text{Vậy}` `x ∈ { -3 ; -2 ; -1 ; 0 ; 1 ; 2 ; 3 ; 4 }`