280=200-x

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Solution for 280=200-x equation: 



280=200-x

We move all terms to the left:

280-(200-x)=0

We add all the numbers together, and all the variables

-(-1x+200)+280=0

We get rid of parentheses

1x-200+280=0

We add all the numbers together, and all the variables

x+80=0

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

x=-80

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