`a) 5/6 - 2 1/3 x = (-1)/3`
`7/3 . x = 5/6 - (-1/3)`
`7/3 . x = 7/6`
`x = 7/6 : 7/3`
`x = 1/2`
Vậy `x = 1/2`
``
`b) ( 3,5 + 2x ) . 2 2/3 = 5 1/3`
`( 7/2 + 2x) = 5 1/3 : 2 2/3`
`7/2 + 2x = 2`
`2x = 2 - 7/2`
`2x = -3/2`
`x = -3/2 : 2`
`x=-3/4`
Vậy `x = -3/4`
``
`c) ( x - 3) + 25 = 1/4`
`( x - 3) = 1/4 - 25`
` x - 3 = -99/4`
`x = -99/4 + 3`
`x=-87/4`
``
`d) 1/2 . ( 2x - 3) - 3 1/2 = 3`
`1/2 . ( 2x - 3) = 3 + 3 1/2`
`1/2 . ( 2x - 3) = 13/2`
`( 2x - 3) = 13/2 : 1/2`
`2x - 3 = 13`
`2x = 13 + 3`
`2x = 16`
`x = 16 : 2`
`x = 8`