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-12=2b-8b
We move all terms to the left:
-12-(2b-8b)=0
We add all the numbers together, and all the variables
-(-6b)-12=0
We get rid of parentheses
6b-12=0
We move all terms containing b to the left, all other terms to the right
6b=12
b=12/6
b=2
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