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9(b+7)=71
We move all terms to the left:
9(b+7)-(71)=0
We multiply parentheses
9b+63-71=0
We add all the numbers together, and all the variables
9b-8=0
We move all terms containing b to the left, all other terms to the right
9b=8
b=8/9
b=8/9
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