4 2/3 - (3/5 : x) = -20% (13/10x - 15). - 5/14 = 3 1/3.(x + 5/2) = -2

`4 2/3 - (3/5 : x) = -20%`

`=> 14/3 - (3/5 : x) = -1/5`

`=> 3/5 :  x = 14/3 + 1/5`

`=> 3/5 : x = 73/15`

`=> x = 3/5 : 73/15`

`=> x = 3/5 . 15/73`

`=> x = 9/73`

Vậy `x = 9/73`

`(13/10 x - 15) . (-5)/14 = 3`

`=> 13/10 x - 15 = 3 : (-5)/14`

`=> 13/10 x - 15 = 3 . 14/(-5)`

`=> 13/10 x - 15 = (-42)/5`

`=> 13/10 x = (-42)/5 + 15`

`=> 13/10 x = 33/5`

`=> x = 33/5 : 13/10`

`=> x = 33/5 . 10/13`

`=> x = 66/13`

Vậy `x = 66/13`

`1/3 . (x + 5/2) = -2`

`=> x + 5/2 = -2 : 1/3`

`=> x + 5/2 = -2 . 3`

`=> x + 5/2 = -6`

`=> x = -6 - 5/2`

`=> x = -17/2`

Vậy `x = -17/2`