28=39-u

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Solution for 28=39-u equation: 



28=39-u

We move all terms to the left:

28-(39-u)=0

We add all the numbers together, and all the variables

-(-1u+39)+28=0

We get rid of parentheses

1u-39+28=0

We add all the numbers together, and all the variables

u-11=0

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

u=11

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