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253=142-x
We move all terms to the left:
253-(142-x)=0
We add all the numbers together, and all the variables
-(-1x+142)+253=0
We get rid of parentheses
1x-142+253=0
We add all the numbers together, and all the variables
x+111=0
We move all terms containing x to the left, all other terms to the right
x=-111
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