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