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2(2b-4)=4
We move all terms to the left:
2(2b-4)-(4)=0
We multiply parentheses
4b-8-4=0
We add all the numbers together, and all the variables
4b-12=0
We move all terms containing b to the left, all other terms to the right
4b=12
b=12/4
b=3
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