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27=b4.5
We move all terms to the left:
27-(b4.5)=0
We add all the numbers together, and all the variables
-(+b4.5)+27=0
We get rid of parentheses
-b4.5+27=0
We move all terms containing b to the left, all other terms to the right
-b4.5=-27
b=-27/1
b=-27
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