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27=4b-b
We move all terms to the left:
27-(4b-b)=0
We add all the numbers together, and all the variables
-(+3b)+27=0
We get rid of parentheses
-3b+27=0
We move all terms containing b to the left, all other terms to the right
-3b=-27
b=-27/-3
b=+9
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