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-12=-2b-1
We move all terms to the left:
-12-(-2b-1)=0
We get rid of parentheses
2b+1-12=0
We add all the numbers together, and all the variables
2b-11=0
We move all terms containing b to the left, all other terms to the right
2b=11
b=11/2
b=5+1/2
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