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(2b+3)=9
We move all terms to the left:
(2b+3)-(9)=0
We get rid of parentheses
2b+3-9=0
We add all the numbers together, and all the variables
2b-6=0
We move all terms containing b to the left, all other terms to the right
2b=6
b=6/2
b=3
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