280+(400-x)=400

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Solution for 280+(400-x)=400 equation: 



280+(400-x)=400

We move all terms to the left:

280+(400-x)-(400)=0

We add all the numbers together, and all the variables

(-1x+400)+280-400=0

We add all the numbers together, and all the variables

(-1x+400)-120=0

We get rid of parentheses

-1x+400-120=0

We add all the numbers together, and all the variables

-1x+280=0

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

-x=-280

x=-280/-1

x=+280

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