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(3b+4)-b=28
We move all terms to the left:
(3b+4)-b-(28)=0
We add all the numbers together, and all the variables
-1b+(3b+4)-28=0
We get rid of parentheses
-1b+3b+4-28=0
We add all the numbers together, and all the variables
2b-24=0
We move all terms containing b to the left, all other terms to the right
2b=24
b=24/2
b=12
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