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3x-(6x-3)=42
We move all terms to the left:
3x-(6x-3)-(42)=0
We get rid of parentheses
3x-6x+3-42=0
We add all the numbers together, and all the variables
-3x-39=0
We move all terms containing x to the left, all other terms to the right
-3x=39
x=39/-3
x=-13
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