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39=x-1212-1227=x
We move all terms to the left:
39-(x-1212-1227)=0
We add all the numbers together, and all the variables
-(x-2439)+39=0
We get rid of parentheses
-x+2439+39=0
We add all the numbers together, and all the variables
-1x+2478=0
We move all terms containing x to the left, all other terms to the right
-x=-2478
x=-2478/-1
x=+2478
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