Đáp án:
`a) x =` `2/5`
`b) x =` `(-8)/3`
Giải thích các bước giải:
`a)` `2/3` .` x -` ( `1/3` . `x + 1` ) `= 2x -` `5/3`
`=>` `2/3` . `x -` `1/3` . `x - 1 = 2x -` `5/3`
`=>` `1/3` `. x - 2x =` - `5/3` `+ 1`
`=>` `1/3` `. x -` `6/3` `. x =` `(-2)/3`
`=>` `(-5)/3` . x = `(-2)/3`
`=> x =` `(-2)/3` . `(-3)/5`
`=> x =` `2/5`
Vậy `x =` `2/5`
`b)` `3/4` `. x -` ( `1/2` `. x - 2 ) =` `2/3` `- ( x + 2 )`
`=>` `3/4` `. x -` `1/2` `. x + 2 =` `2/3` `- x - 2`
`=>` `1/4` `. x + x =` `2/3` `- 2 - 2`
`=>` `1/4` `. x +` `4/4` `. x =` `2/3` `-` `12/3`
`=>` `5/4` `. x` `=` `(-10)/3`
`=> x =` `(-10)/3` . `4/5`
`=> x =` `(-8)/3`
Vậy `x =` `(-8)/3`