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7+8(b+7)=87
We move all terms to the left:
7+8(b+7)-(87)=0
We add all the numbers together, and all the variables
8(b+7)-80=0
We multiply parentheses
8b+56-80=0
We add all the numbers together, and all the variables
8b-24=0
We move all terms containing b to the left, all other terms to the right
8b=24
b=24/8
b=3
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