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200=x+12644
We move all terms to the left:
200-(x+12644)=0
We get rid of parentheses
-x-12644+200=0
We add all the numbers together, and all the variables
-1x-12444=0
We move all terms containing x to the left, all other terms to the right
-x=12444
x=12444/-1
x=-12444
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