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2b-9=-b-(6)
We move all terms to the left:
2b-9-(-b-(6))=0
We add all the numbers together, and all the variables
2b-(-1b-6)-9=0
We get rid of parentheses
2b+1b+6-9=0
We add all the numbers together, and all the variables
3b-3=0
We move all terms containing b to the left, all other terms to the right
3b=3
b=3/3
b=1
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