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5b+(6+3b)=12
We move all terms to the left:
5b+(6+3b)-(12)=0
We add all the numbers together, and all the variables
5b+(3b+6)-12=0
We get rid of parentheses
5b+3b+6-12=0
We add all the numbers together, and all the variables
8b-6=0
We move all terms containing b to the left, all other terms to the right
8b=6
b=6/8
b=3/4
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