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5+2(5b+8)=81
We move all terms to the left:
5+2(5b+8)-(81)=0
We add all the numbers together, and all the variables
2(5b+8)-76=0
We multiply parentheses
10b+16-76=0
We add all the numbers together, and all the variables
10b-60=0
We move all terms containing b to the left, all other terms to the right
10b=60
b=60/10
b=6
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