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-66+3x=42+6x
We move all terms to the left:
-66+3x-(42+6x)=0
We add all the numbers together, and all the variables
3x-(6x+42)-66=0
We get rid of parentheses
3x-6x-42-66=0
We add all the numbers together, and all the variables
-3x-108=0
We move all terms containing x to the left, all other terms to the right
-3x=108
x=108/-3
x=-36
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