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508=20b-12
We move all terms to the left:
508-(20b-12)=0
We get rid of parentheses
-20b+12+508=0
We add all the numbers together, and all the variables
-20b+520=0
We move all terms containing b to the left, all other terms to the right
-20b=-520
b=-520/-20
b=+26
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