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40=2b+8b
We move all terms to the left:
40-(2b+8b)=0
We add all the numbers together, and all the variables
-(+10b)+40=0
We get rid of parentheses
-10b+40=0
We move all terms containing b to the left, all other terms to the right
-10b=-40
b=-40/-10
b=+4
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