28=5u-u

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Solution for 28=5u-u equation: 



28=5u-u

We move all terms to the left:

28-(5u-u)=0

We add all the numbers together, and all the variables

-(+4u)+28=0

We get rid of parentheses

-4u+28=0

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

-4u=-28

u=-28/-4

u=+7

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