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331=6b+7
We move all terms to the left:
331-(6b+7)=0
We get rid of parentheses
-6b-7+331=0
We add all the numbers together, and all the variables
-6b+324=0
We move all terms containing b to the left, all other terms to the right
-6b=-324
b=-324/-6
b=+54
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