Answer:[tex]-4 + 3m + 4n[/tex]Step-by-step explanation:In this question, you are combining like terms, meaning doing equations to numbers that fit with only each other.So we should start on the number without variables:23 and 27Match them up together and you should find your first equation:23 - 7==> -4So we should have -4 + 8m + 4n - 5mNow we should combine the numbers with the variable of m:8m and 5mMatch them up together and you should find your first equation:8m - 5m==> 3mSo we should now have -4 + 3m + 4nSince there are no other variables of n, we are all done:-4 + 3m + 4n is your final answer