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4b+5(b+7)=89
We move all terms to the left:
4b+5(b+7)-(89)=0
We multiply parentheses
4b+5b+35-89=0
We add all the numbers together, and all the variables
9b-54=0
We move all terms containing b to the left, all other terms to the right
9b=54
b=54/9
b=6
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