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