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-2b-4=4b+8
We move all terms to the left:
-2b-4-(4b+8)=0
We get rid of parentheses
-2b-4b-8-4=0
We add all the numbers together, and all the variables
-6b-12=0
We move all terms containing b to the left, all other terms to the right
-6b=12
b=12/-6
b=-2
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