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4b-71=2b-25
We move all terms to the left:
4b-71-(2b-25)=0
We get rid of parentheses
4b-2b+25-71=0
We add all the numbers together, and all the variables
2b-46=0
We move all terms containing b to the left, all other terms to the right
2b=46
b=46/2
b=23
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