11u=21+8u

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Solution for 11u=21+8u equation: 



11u=21+8u

We move all terms to the left:

11u-(21+8u)=0

We add all the numbers together, and all the variables

11u-(8u+21)=0

We get rid of parentheses

11u-8u-21=0

We add all the numbers together, and all the variables

3u-21=0

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

3u=21

u=21/3

u=7

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