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b=3b+1
We move all terms to the left:
b-(3b+1)=0
We get rid of parentheses
b-3b-1=0
We add all the numbers together, and all the variables
-2b-1=0
We move all terms containing b to the left, all other terms to the right
-2b=1
b=1/-2
b=-1/2
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