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42=11-x
We move all terms to the left:
42-(11-x)=0
We add all the numbers together, and all the variables
-(-1x+11)+42=0
We get rid of parentheses
1x-11+42=0
We add all the numbers together, and all the variables
x+31=0
We move all terms containing x to the left, all other terms to the right
x=-31
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