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42=4x+3xx=
We move all terms to the left:
42-(4x+3xx)=0
We add all the numbers together, and all the variables
-(+4x+3xx)+42=0
We get rid of parentheses
-4x-3xx+42=0
We move all terms containing x to the left, all other terms to the right
-4x-3xx=-42
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