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-6b-6b-9=8b-9
We move all terms to the left:
-6b-6b-9-(8b-9)=0
We add all the numbers together, and all the variables
-12b-(8b-9)-9=0
We get rid of parentheses
-12b-8b+9-9=0
We add all the numbers together, and all the variables
-20b=0
b=0/-20
b=0
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