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-(12-2b)=-7b+6
We move all terms to the left:
-(12-2b)-(-7b+6)=0
We add all the numbers together, and all the variables
-(-2b+12)-(-7b+6)=0
We get rid of parentheses
2b+7b-12-6=0
We add all the numbers together, and all the variables
9b-18=0
We move all terms containing b to the left, all other terms to the right
9b=18
b=18/9
b=2
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