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(438+x)-238=517
We move all terms to the left:
(438+x)-238-(517)=0
We add all the numbers together, and all the variables
(x+438)-238-517=0
We add all the numbers together, and all the variables
(x+438)-755=0
We get rid of parentheses
x+438-755=0
We add all the numbers together, and all the variables
x-317=0
We move all terms containing x to the left, all other terms to the right
x=317
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