U=x-4

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Solution for U=x-4 equation: 



=U-4

We move all terms to the left:

-(U-4)=0

We get rid of parentheses

-U+4=0

We add all the numbers together, and all the variables

-1U+4=0

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

-U=-4

U=-4/-1

U=+4

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