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10b-25=2b+31
We move all terms to the left:
10b-25-(2b+31)=0
We get rid of parentheses
10b-2b-31-25=0
We add all the numbers together, and all the variables
8b-56=0
We move all terms containing b to the left, all other terms to the right
8b=56
b=56/8
b=7
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