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8b+b=8b+7
We move all terms to the left:
8b+b-(8b+7)=0
We add all the numbers together, and all the variables
9b-(8b+7)=0
We get rid of parentheses
9b-8b-7=0
We add all the numbers together, and all the variables
b-7=0
We move all terms containing b to the left, all other terms to the right
b=7
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