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8b=3b-20
We move all terms to the left:
8b-(3b-20)=0
We get rid of parentheses
8b-3b+20=0
We add all the numbers together, and all the variables
5b+20=0
We move all terms containing b to the left, all other terms to the right
5b=-20
b=-20/5
b=-4
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