`#Dark`
`7x-6x=9`
`to` `(7-6)x=9`
`to` `x=9`
Lời giải:
`7x - 6x = 9`
`(7 - 6) . x = 9`
`1 . x = 9`
`x = 9`
Vậy `x = 9`
Choose the excessive word in the sentence below.