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-9b-1=-7-7b
We move all terms to the left:
-9b-1-(-7-7b)=0
We add all the numbers together, and all the variables
-9b-(-7b-7)-1=0
We get rid of parentheses
-9b+7b+7-1=0
We add all the numbers together, and all the variables
-2b+6=0
We move all terms containing b to the left, all other terms to the right
-2b=-6
b=-6/-2
b=+3
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