6u=3u+21

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Solution for 6u=3u+21 equation: 



6u=3u+21

We move all terms to the left:

6u-(3u+21)=0

We get rid of parentheses

6u-3u-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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