280=77-x

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Solution for 280=77-x equation: 



280=77-x

We move all terms to the left:

280-(77-x)=0

We add all the numbers together, and all the variables

-(-1x+77)+280=0

We get rid of parentheses

1x-77+280=0

We add all the numbers together, and all the variables

x+203=0

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

x=-203

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