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3b=6b-12
We move all terms to the left:
3b-(6b-12)=0
We get rid of parentheses
3b-6b+12=0
We add all the numbers together, and all the variables
-3b+12=0
We move all terms containing b to the left, all other terms to the right
-3b=-12
b=-12/-3
b=+4
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