U=4-2x

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Solution for U=4-2x equation: 



=4-2U

We move all terms to the left:

-(4-2U)=0

We add all the numbers together, and all the variables

-(-2U+4)=0

We get rid of parentheses

2U-4=0

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

2U=4

U=4/2

U=2

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