Đáp án:
`x =` `9/4`
Giải thích các bước giải:
`3/4` `-` ( `2/3` `- x +` `7/12` ) `= 2 -` | 1`1/4` `-` `3/2` |
`3/4` `-` `2/3` `+ x -` `7/12` `=` `2 -` | `5/4` `-` `6/4` |
`3/4` `-` `2/3` `+ x -` `7/12` `= 2 -` | `(-1)/4` |
`9/12` `-` `8/12` `-` `7/12` `+ x =` `8/4` `-` `1/4`
`(-6)/12` `+ x =` `7/4`
`(-1)/2` `+ x =` `7/4`
`x =` `7/4` `+` `1/2`
`x =` `7/4` `+` `2/4`
`x =` `9/4`
Vậy` x =` `9/4`