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-11+8b=20b+13
We move all terms to the left:
-11+8b-(20b+13)=0
We get rid of parentheses
8b-20b-13-11=0
We add all the numbers together, and all the variables
-12b-24=0
We move all terms containing b to the left, all other terms to the right
-12b=24
b=24/-12
b=-2
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