u=21-6u

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Solution for u=21-6u equation: 



u=21-6u

We move all terms to the left:

u-(21-6u)=0

We add all the numbers together, and all the variables

u-(-6u+21)=0

We get rid of parentheses

u+6u-21=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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