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657=b.5
We move all terms to the left:
657-(b.5)=0
We add all the numbers together, and all the variables
-(+b.5)+657=0
We get rid of parentheses
-b.5+657=0
We move all terms containing b to the left, all other terms to the right
-b.5=-657
b=-657/1
b=-657
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