242=123-u

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Solution for 242=123-u equation: 



242=123-u

We move all terms to the left:

242-(123-u)=0

We add all the numbers together, and all the variables

-(-1u+123)+242=0

We get rid of parentheses

1u-123+242=0

We add all the numbers together, and all the variables

u+119=0

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

u=-119

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