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280=39-x
We move all terms to the left:
280-(39-x)=0
We add all the numbers together, and all the variables
-(-1x+39)+280=0
We get rid of parentheses
1x-39+280=0
We add all the numbers together, and all the variables
x+241=0
We move all terms containing x to the left, all other terms to the right
x=-241
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