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b-19+b=b+42
We move all terms to the left:
b-19+b-(b+42)=0
We add all the numbers together, and all the variables
2b-(b+42)-19=0
We get rid of parentheses
2b-b-42-19=0
We add all the numbers together, and all the variables
b-61=0
We move all terms containing b to the left, all other terms to the right
b=61
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