Question

How do you solve `5x+2x-9=40`?

Answer 1

x=7

Explanation:

`5x +2x-9=40`
`(5+2)x-9=40`
`7x-9=40`
`7x-9+9=40+9`
`7x=49`
`7x-:7=49/7`
`:.x=7`