Question

How do you simplify `15d - 9 + 2d`?

Answer 1

Regroup to get `17d-9`

Explanation:

`15d - 9 +2d`
`color(white)("XXXX")` `=15d + 2d - 9`

`color(white)("XXXX")` `= (15+2)d -9`

`color(white)("XXXX")` `=17d-9`