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Answer:
Diego's answer 4b+9b is correct:)
Step-by-step explanation:
Our first step is to combine like terms.
Causing you to combine 7a and -3a which gives you 4a because 7-3=4
Next, you would combine 5b and 4b which gives you 9b because 5+4=9
After you have combined like terms you would have your simplified equation 4b+9b causing Diego's answer to be correct!
Hope this helps!
Please tell me if I am wrong, I enjoy learning from my mistakaes:)
Have a great rest of your day:)