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(3b+1)=7
We move all terms to the left:
(3b+1)-(7)=0
We get rid of parentheses
3b+1-7=0
We add all the numbers together, and all the variables
3b-6=0
We move all terms containing b to the left, all other terms to the right
3b=6
b=6/3
b=2
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