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-120=0

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

-x=120

x=120/-1

x=-120

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