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42=35+x
We move all terms to the left:
42-(35+x)=0
We add all the numbers together, and all the variables
-(x+35)+42=0
We get rid of parentheses
-x-35+42=0
We add all the numbers together, and all the variables
-1x+7=0
We move all terms containing x to the left, all other terms to the right
-x=-7
x=-7/-1
x=+7
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