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250=208-x
We move all terms to the left:
250-(208-x)=0
We add all the numbers together, and all the variables
-(-1x+208)+250=0
We get rid of parentheses
1x-208+250=0
We add all the numbers together, and all the variables
x+42=0
We move all terms containing x to the left, all other terms to the right
x=-42
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