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3b-5=25-7b
We move all terms to the left:
3b-5-(25-7b)=0
We add all the numbers together, and all the variables
3b-(-7b+25)-5=0
We get rid of parentheses
3b+7b-25-5=0
We add all the numbers together, and all the variables
10b-30=0
We move all terms containing b to the left, all other terms to the right
10b=30
b=30/10
b=3
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