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18=8b-2b
We move all terms to the left:
18-(8b-2b)=0
We add all the numbers together, and all the variables
-(+6b)+18=0
We get rid of parentheses
-6b+18=0
We move all terms containing b to the left, all other terms to the right
-6b=-18
b=-18/-6
b=+3
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