giúp mk câu hỏi này với

`a,`

`{-2}/15 - x= {-3}/10`

`⇒ x = {-2}/15 - {-3}/10`

`⇒ x = {-4}/30 + 9/30`

`⇒ x = 1/6`

Vậy `x = 1/6`

`b,`

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

`⇒ x + 1/3 = 2/5 + 1/3`

`⇒ x = 2/5 + 1/3 - 1/3`

`⇒ x = 2/5`

Vậy `x = 2/5`

`c,`

`-2/3 x = 4/15`

`⇒ x = 4/15 : ( -2/3 )`

`⇒ x = 4/15 . ( -3/2 )`

`⇒ x = -2/5`

Vậy `x = -2/5`

`d,`

`-7/19 x = -13/24`

`⇒ x = (-13/24) : ( -7/19 )`

`⇒ x = ( -13/24 ) . ( -19/7 )`

`⇒ x = 247/168`

Vậy `x = 247/168`

`e,`

`{-2}/5 + 5/6 x = {-4}/15`

`⇒ 5/6 x = {-4}/15 - {-2}/5`

`⇒ 5/6 x = {-4}/15 + 6/15`

`⇒ 5/6 x = 2/15`

`⇒ x = 2/15 : 5/6`

`⇒ x = 2/15 . 6/5`

`⇒ x = 4/25`

Vậy `x = 4/25`

`g,`

`( x + 5/3 ) . ( x - 5/4 ) = 0`

`⇒ @ TH1: x + 5/3 = 0 ⇒ x = -5/3`

`⇒ @ TH2: x - 5/4 = 0 ⇒ x = 5/4`

Vậy `x ∈ { -5/3 ; 5/4 }`