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66-b=42+66
We move all terms to the left:
66-b-(42+66)=0
We add all the numbers together, and all the variables
-b+66-108=0
We add all the numbers together, and all the variables
-1b-42=0
We move all terms containing b to the left, all other terms to the right
-b=42
b=42/-1
b=-42
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