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(X-12)+X=600
We move all terms to the left:
(X-12)+X-(600)=0
We add all the numbers together, and all the variables
X+(X-12)-600=0
We get rid of parentheses
X+X-12-600=0
We add all the numbers together, and all the variables
2X-612=0
We move all terms containing X to the left, all other terms to the right
2X=612
X=612/2
X=306
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