Giúp tớ giải với ạ tớ cảm ơn

`a ) ( x + 5 ) .3 = 21`

`x + 5 = 21 : 3`

`x + 5 = 7`

`x = 7 - 5`

`x = 2`

`b ) 4x - 11 = 29`

`4x = 29 + 11`

`4x = 40`

`x = 40 : 4`

`x = 10`

`c ) 5/4x + 2/3 = 1/2`

`5/4x = 1/2 - 2/3`

`5/4x = 3/6 - 4/6`

`5/4x = (-1)/6`

`x = (-1)/6 : 5/4`

`x = (-1)/6 . 4/5`

`x = (-2)/15`

`d ) 4/3 . ( x - 1 ) = 2/3`

`x - 1 = 2/3 : 4/3`

`x - 1 = 2/3 . 3/4`

`x - 1 = 1/2`

`x = 1/2 + 1`

`x = 1/2 +  2/2`

`x = 3/2`

`- - - - - -- -`

$\text{@Tnhye@}$