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XXX-X=X+15
We move all terms to the left:
XXX-X-(X+15)=0
We add all the numbers together, and all the variables
-1X+XXX-(X+15)=0
We get rid of parentheses
-1X+XXX-X-15=0
We add all the numbers together, and all the variables
-2X+XXX-15=0
We move all terms containing X to the left, all other terms to the right
-2X+XXX=15
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