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248=104-x
We move all terms to the left:
248-(104-x)=0
We add all the numbers together, and all the variables
-(-1x+104)+248=0
We get rid of parentheses
1x-104+248=0
We add all the numbers together, and all the variables
x+144=0
We move all terms containing x to the left, all other terms to the right
x=-144
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