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-12+3b=5b-8
We move all terms to the left:
-12+3b-(5b-8)=0
We get rid of parentheses
3b-5b+8-12=0
We add all the numbers together, and all the variables
-2b-4=0
We move all terms containing b to the left, all other terms to the right
-2b=4
b=4/-2
b=-2
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