9u=18+3u

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Solution for 9u=18+3u equation: 



9u=18+3u

We move all terms to the left:

9u-(18+3u)=0

We add all the numbers together, and all the variables

9u-(3u+18)=0

We get rid of parentheses

9u-3u-18=0

We add all the numbers together, and all the variables

6u-18=0

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

6u=18

u=18/6

u=3

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