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-3=1+b-2b
We move all terms to the left:
-3-(1+b-2b)=0
We add all the numbers together, and all the variables
-(-1b+1)-3=0
We get rid of parentheses
1b-1-3=0
We add all the numbers together, and all the variables
b-4=0
We move all terms containing b to the left, all other terms to the right
b=4
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