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10b-85=7b-55
We move all terms to the left:
10b-85-(7b-55)=0
We get rid of parentheses
10b-7b+55-85=0
We add all the numbers together, and all the variables
3b-30=0
We move all terms containing b to the left, all other terms to the right
3b=30
b=30/3
b=10
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