U=12-3u

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Solution for U=12-3u equation: 



=12-3U

We move all terms to the left:

-(12-3U)=0

We add all the numbers together, and all the variables

-(-3U+12)=0

We get rid of parentheses

3U-12=0

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

3U=12

U=12/3

U=4

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