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x+42=2x+4
We move all terms to the left:
x+42-(2x+4)=0
We get rid of parentheses
x-2x-4+42=0
We add all the numbers together, and all the variables
-1x+38=0
We move all terms containing x to the left, all other terms to the right
-x=-38
x=-38/-1
x=+38
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