21-6u=u

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Solution for 21-6u=u equation: 



21-6u=u

We move all terms to the left:

21-6u-(u)=0

We add all the numbers together, and all the variables

-7u+21=0

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

-7u=-21

u=-21/-7

u=+3

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