258=123-x

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Solution for 258=123-x equation: 



258=123-x

We move all terms to the left:

258-(123-x)=0

We add all the numbers together, and all the variables

-(-1x+123)+258=0

We get rid of parentheses

1x-123+258=0

We add all the numbers together, and all the variables

x+135=0

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

x=-135

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