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-3+4b=12+3b
We move all terms to the left:
-3+4b-(12+3b)=0
We add all the numbers together, and all the variables
4b-(3b+12)-3=0
We get rid of parentheses
4b-3b-12-3=0
We add all the numbers together, and all the variables
b-15=0
We move all terms containing b to the left, all other terms to the right
b=15
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