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4b+6-b-9-5b=7b-2-b+15
We move all terms to the left:
4b+6-b-9-5b-(7b-2-b+15)=0
We add all the numbers together, and all the variables
4b-b-5b-(6b+13)+6-9=0
We add all the numbers together, and all the variables
-2b-(6b+13)-3=0
We get rid of parentheses
-2b-6b-13-3=0
We add all the numbers together, and all the variables
-8b-16=0
We move all terms containing b to the left, all other terms to the right
-8b=16
b=16/-8
b=-2
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