The answer is b=c-2a/2, as it has the correct steps.
To prove the correct answer:
2(a+b)=c
Distribute 2 to get 2a+2b
2a+2b=c
Subtract 2a
2b=c-2a
Then divide by 2
b=c-2a/2
Therefore b=c-2a/2 is the correct answer.
Hope it helps!
