Answer:
2a + 7b + 4
Step-by-step explanation:
4a + 8 - 2a - 4 + 7b
<u><em>Group like terms</em></u>
4a - 2a + 7b + 8 - 4
<u><em>Add similar elements (4a - 2a)</em></u>
2a + 7b + 8 - 4
<u><em>Add/Subtract (8 - 4)</em></u>
2a + 7b + 4
I believe the answer is 24 : 1
In this order it is positive, negative, negative. negative. Hope this helps. Let me know if you need anything else.