3u=28+u

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Solution for 3u=28+u equation: 



3u=28+u

We move all terms to the left:

3u-(28+u)=0

We add all the numbers together, and all the variables

3u-(u+28)=0

We get rid of parentheses

3u-u-28=0

We add all the numbers together, and all the variables

2u-28=0

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

2u=28

u=28/2

u=14

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