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-4-(b+3)=-7-8b
We move all terms to the left:
-4-(b+3)-(-7-8b)=0
We add all the numbers together, and all the variables
-(b+3)-(-8b-7)-4=0
We get rid of parentheses
-b+8b-3+7-4=0
We add all the numbers together, and all the variables
7b=0
b=0/7
b=0
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