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8b=2b-4
We move all terms to the left:
8b-(2b-4)=0
We get rid of parentheses
8b-2b+4=0
We add all the numbers together, and all the variables
6b+4=0
We move all terms containing b to the left, all other terms to the right
6b=-4
b=-4/6
b=-2/3
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