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42=9-3x
We move all terms to the left:
42-(9-3x)=0
We add all the numbers together, and all the variables
-(-3x+9)+42=0
We get rid of parentheses
3x-9+42=0
We add all the numbers together, and all the variables
3x+33=0
We move all terms containing x to the left, all other terms to the right
3x=-33
x=-33/3
x=-11
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