28=7+3u

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Solution for 28=7+3u equation: 



28=7+3u

We move all terms to the left:

28-(7+3u)=0

We add all the numbers together, and all the variables

-(3u+7)+28=0

We get rid of parentheses

-3u-7+28=0

We add all the numbers together, and all the variables

-3u+21=0

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

-3u=-21

u=-21/-3

u=+7

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