`a ) x - 7/4 = -5/8`

`x = -5/8 + 7/4`

`x = -5/8 + 14/8`

`x = 9/8`

Vậy `x = 9/8`

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`b ) -2/3 x + 0,5 = 7,5`

`-2/3 x = 7,5 - 0,5`

`x = 7/1 : -2/3`

`x = -21/2`

Vậy `x = -21/2`

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`c ) 1/4 + 4/3 : x = 1/6`

`4/3 : x = 1/6 - 1/4`

`x = 4/3 : -1/12`

`x = -4/3`

`x = -16`

Vậy `x = -16`

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`d ) ( 2x - 1)/12 - 3/4 = -2/3`

`( 2x - 1)/12 = -2/3 + 3/4`

` ( 2x - 1)/12 = 1/12`

` 2x - 1 = 1`

` 2x = 1 + 1`

`x = 2 : 2`

`x = 1`

Vậy `x = 1`

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`e ) (3x - 1)( -1/2 x + 5 ) = 0`

` 3x - 1 = 0 ` hoặc `-1/2 x + 5 = 0`

` 3x = 1` hoặc` -1/2 x = -5`

` x = 1/3` hoặc ` x = -5 : -1/2`

` x = 1/3` hoặc `x = 10`

Vậy `x ∈ { 1/3 ; 10 }`

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` f ) -14/9 + 2/9 xx x^2 = 2`

`2/9 xx x^2 = 2 - ( -14/9 )`

`2/9 xx x^2 = 32/9`

`x^2 = 32/9 : 2/9`

`x^2 = 16`

`x = ( ± 4 )^2`

`x = -4` hoặc `x = 4`

Vậy `x = -4` hoặc `x = 4`