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51=6b+9
We move all terms to the left:
51-(6b+9)=0
We get rid of parentheses
-6b-9+51=0
We add all the numbers together, and all the variables
-6b+42=0
We move all terms containing b to the left, all other terms to the right
-6b=-42
b=-42/-6
b=+7
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