Answer :
7r + 2r - 4
7r + 2r = 9r
Answer - 9r - 4
Since 4 isn't a like term to 9r, you can't subtract it.
[Im unsure if you can do the like term with subtracting but I' sure with this answer!]
7r + 2r = 9r
Answer - 9r - 4
Since 4 isn't a like term to 9r, you can't subtract it.
[Im unsure if you can do the like term with subtracting but I' sure with this answer!]