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9b-66=6b-42
We move all terms to the left:
9b-66-(6b-42)=0
We get rid of parentheses
9b-6b+42-66=0
We add all the numbers together, and all the variables
3b-24=0
We move all terms containing b to the left, all other terms to the right
3b=24
b=24/3
b=8
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