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8b+4=4b+2=
We move all terms to the left:
8b+4-(4b+2)=0
We get rid of parentheses
8b-4b-2+4=0
We add all the numbers together, and all the variables
4b+2=0
We move all terms containing b to the left, all other terms to the right
4b=-2
b=-2/4
b=-1/2
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