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4b+6(b+2)=82
We move all terms to the left:
4b+6(b+2)-(82)=0
We multiply parentheses
4b+6b+12-82=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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