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2(8+5b)=86
We move all terms to the left:
2(8+5b)-(86)=0
We add all the numbers together, and all the variables
2(5b+8)-86=0
We multiply parentheses
10b+16-86=0
We add all the numbers together, and all the variables
10b-70=0
We move all terms containing b to the left, all other terms to the right
10b=70
b=70/10
b=7
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