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3=8b-5b
We move all terms to the left:
3-(8b-5b)=0
We add all the numbers together, and all the variables
-(+3b)+3=0
We get rid of parentheses
-3b+3=0
We move all terms containing b to the left, all other terms to the right
-3b=-3
b=-3/-3
b=1
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