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-(2b-1)=7
We move all terms to the left:
-(2b-1)-(7)=0
We get rid of parentheses
-2b+1-7=0
We add all the numbers together, and all the variables
-2b-6=0
We move all terms containing b to the left, all other terms to the right
-2b=6
b=6/-2
b=-3
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