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-13-8b=-7b
We move all terms to the left:
-13-8b-(-7b)=0
We get rid of parentheses
-8b+7b-13=0
We add all the numbers together, and all the variables
-1b-13=0
We move all terms containing b to the left, all other terms to the right
-b=13
b=13/-1
b=-13
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