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12+3b=6b-6
We move all terms to the left:
12+3b-(6b-6)=0
We get rid of parentheses
3b-6b+6+12=0
We add all the numbers together, and all the variables
-3b+18=0
We move all terms containing b to the left, all other terms to the right
-3b=-18
b=-18/-3
b=+6
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