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-49+12b=71+7b
We move all terms to the left:
-49+12b-(71+7b)=0
We add all the numbers together, and all the variables
12b-(7b+71)-49=0
We get rid of parentheses
12b-7b-71-49=0
We add all the numbers together, and all the variables
5b-120=0
We move all terms containing b to the left, all other terms to the right
5b=120
b=120/5
b=24
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