255=129-x

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Solution for 255=129-x equation: 



255=129-x

We move all terms to the left:

255-(129-x)=0

We add all the numbers together, and all the variables

-(-1x+129)+255=0

We get rid of parentheses

1x-129+255=0

We add all the numbers together, and all the variables

x+126=0

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

x=-126

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