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b=7-8b=18
We move all terms to the left:
b-(7-8b)=0
We add all the numbers together, and all the variables
b-(-8b+7)=0
We get rid of parentheses
b+8b-7=0
We add all the numbers together, and all the variables
9b-7=0
We move all terms containing b to the left, all other terms to the right
9b=7
b=7/9
b=7/9
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