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3b+7b+4-12-8b=12b+4+27b
We move all terms to the left:
3b+7b+4-12-8b-(12b+4+27b)=0
We add all the numbers together, and all the variables
3b+7b-8b-(39b+4)+4-12=0
We add all the numbers together, and all the variables
2b-(39b+4)-8=0
We get rid of parentheses
2b-39b-4-8=0
We add all the numbers together, and all the variables
-37b-12=0
We move all terms containing b to the left, all other terms to the right
-37b=12
b=12/-37
b=-12/37
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