Answer:

Step-by-step explanation:

(3m - 4n - 7) - (8m + n - 6)
3m - 8m = - 5m
-4n - n = -5n
-7 - (-6) = -7 + 6 = -1
-5m - 5n - 1 is your answer
hope this helps
Multiply both sides by 2.
2m = a + b
Subtract both sides by b.
2m - b = a
67, 66, 67, and 45, respectively.