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`a, 2x - 3 = x + 1/2`
`=> 2x - x = 1/2 + 3`
`=> x = 7/2`
Vậy `x=7/2`
`b, 4x - (2x + 1) = 3 - 1/3 + x`
`=> 4x - 2x -x = 3 - 1/3 + 1`
`=> x = 11/3`
Vậy `x=11/3`
`c, 4/3 + (1,25 - x) = 2,25`
`=> 4/3 + 1,25 - 2,25 = x`
`=> x=1/3`
Vậy `x=1/3`