4u=21+3u

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Solution for 4u=21+3u equation: 



4u=21+3u

We move all terms to the left:

4u-(21+3u)=0

We add all the numbers together, and all the variables

4u-(3u+21)=0

We get rid of parentheses

4u-3u-21=0

We add all the numbers together, and all the variables

u-21=0

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

u=21

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