c) `x` : ( -1`3/21`) + 3`1/2` = -1`3/4` d) `x` - `25%` `x` = `0,5`
`x` : `-24/21` + `7/2` = `-7/4` `x`. `1` - `1/4` `x` = `1/2`
`x` : `-24/21` = `-7/4` - `7/2` `x` ( `1` - `1/4`) = `1/2`
`x` : `-24/21` = `-21/4` `x` . `3/4` = `1/2`
`x` = `-21/4` . `-24/21` `x` = `1/2` : `3/4`
`x` = `6` `x` = `2/3`
bài 7)
a) `x` + `3/22` = `27/121` . `11/9` b) `1/5` : `x` = `1/5` - `1/7`
`x` + `3/22` = `3/11` `1/5` : `x` = `2/35`
`x` = `3/11` - `3/22` `x` = `1/5` : `2/35`
`x` = `3/22` `x` = `7/2`
c) ( -2`2/11`) : `x` - 4`2/3` = `5/6` d) 3`1/3` `x` + 16 `3/4`= `-13,25`
`-24/11` : `x` - `14/3` = `5/6` `10/3` `x` + `67/4` = `-53/4`
`-24/11` : `x` = `5/6` + `14/3` `10/3` `x` = `-53/4` - `67/4`
`-24/11` : `x` = `11/2` `10/3` `x` = `-30`
`x` = `-24/11` : `11/2` `x` = `-30` : `10/3`
`x` = `-48/121` `x` = `-9`