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3b+(b+84)=180
We move all terms to the left:
3b+(b+84)-(180)=0
We get rid of parentheses
3b+b+84-180=0
We add all the numbers together, and all the variables
4b-96=0
We move all terms containing b to the left, all other terms to the right
4b=96
b=96/4
b=24
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