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