Answer:
The answer is 4a + 7b
Step-by-step explanation:
5a + 3b - a + 4b
= 5a - a + 3b + 4b
= 4a + 7b
4a+7b
you just add or subtract the a's with the a's and the b's with the b's
example
4a-4a=0
4a-2a=2a
2a+4a+b=6a+b
