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8b-4(b-2)=40
We move all terms to the left:
8b-4(b-2)-(40)=0
We multiply parentheses
8b-4b+8-40=0
We add all the numbers together, and all the variables
4b-32=0
We move all terms containing b to the left, all other terms to the right
4b=32
b=32/4
b=8
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