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3b+7=12+b
We move all terms to the left:
3b+7-(12+b)=0
We add all the numbers together, and all the variables
3b-(b+12)+7=0
We get rid of parentheses
3b-b-12+7=0
We add all the numbers together, and all the variables
2b-5=0
We move all terms containing b to the left, all other terms to the right
2b=5
b=5/2
b=2+1/2
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