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81=6b-3
We move all terms to the left:
81-(6b-3)=0
We get rid of parentheses
-6b+3+81=0
We add all the numbers together, and all the variables
-6b+84=0
We move all terms containing b to the left, all other terms to the right
-6b=-84
b=-84/-6
b=+14
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