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-12=6b-4b
We move all terms to the left:
-12-(6b-4b)=0
We add all the numbers together, and all the variables
-(+2b)-12=0
We get rid of parentheses
-2b-12=0
We move all terms containing b to the left, all other terms to the right
-2b=12
b=12/-2
b=-6
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