a) `1/3x + 2/5(x-1) =0`
`=> 1/3 x + 2/5x - 2/5 =0`
`=> x(1/3 + 2/5) - 2/5 =0`
`=> x. 11/15 - 2/5 =0`
`=>x. 11/15 = 2/5`
`=> x= 2/5 : 11/15`
`=> x = 2/5. 15/11`
`=> x= 6/11`
Vậy `x= 6/11`
b) `(2x-3) - (x+2) = (x-2) - 3(x-5)`
`=> 2x -3 - x -2 = x-2 - 3x + 15`
`=> (2x-x) - (3+2) = (x-3x) - (2-15)`
`=> x - 5 = -2x + 13`
`=> x + 2x= 13 + 5`
`=> 3x= 18`
`=> x= 18:3`
`=> x=6`
Vậy `x=6`