280=x-400

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Solution for 280=x-400 equation: 



280=x-400

We move all terms to the left:

280-(x-400)=0

We get rid of parentheses

-x+400+280=0

We add all the numbers together, and all the variables

-1x+680=0

We move all terms containing x to the left, all other terms to the right

-x=-680

x=-680/-1

x=+680

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