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250=203-x
We move all terms to the left:
250-(203-x)=0
We add all the numbers together, and all the variables
-(-1x+203)+250=0
We get rid of parentheses
1x-203+250=0
We add all the numbers together, and all the variables
x+47=0
We move all terms containing x to the left, all other terms to the right
x=-47
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