123=249-x

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Solution for 123=249-x equation: 



123=249-x

We move all terms to the left:

123-(249-x)=0

We add all the numbers together, and all the variables

-(-1x+249)+123=0

We get rid of parentheses

1x-249+123=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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