U12=4+3n

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Solution for U12=4+3n equation: 



12=4+3U

We move all terms to the left:

12-(4+3U)=0

We add all the numbers together, and all the variables

-(3U+4)+12=0

We get rid of parentheses

-3U-4+12=0

We add all the numbers together, and all the variables

-3U+8=0

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

-3U=-8

U=-8/-3

U=2+2/3

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