`1)` `4/7 + 15/4 - 11/4 + 3/7 - 1/2 + 1/3`

`= ( 4/7 + 3/7 ) + (15/4 - 11/4 ) - (3/6 - 2/6)`

`= 1 + 1 - 1/6`

`= 2 - 1/6`

`= 11/6`.

`2)`

`a)` `1/4 x - (-7/5) = -5/3`

`1/4 x + 7/5 = -5/3`

`1/4 x = -5/3 - 7/5`

`1/4 x = -46/15`

`x = -46/15 . 4`

`x = -184/15`

Vậy `x=-184/15`.

``

`b)` ` 2 1/3x - 3/4 = 1 1/6`

`7/3 x - 3/4 = 7/6`

`7/3 x = 7/6 + 3/4`

`7/3 x = 23/12`

`x = 23/12 . 3/7`

`x = 23/28`.

Vậy `x=23/28`.

``

`c)` `3x - 3/2 - 5x + 10/3 = 1`

`-2x + (-3/2 + 10/3)=1`

`-2x + 11/6 = 1`

`-2x = 1 - 11/6`

`-2x = -5/6`

`x = 5/6 . 1/2`

`x = 5/12`

Vậy `x = 5/12`.