3u+9=30

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Solution for 3u+9=30 equation: 



3u+9=30

We move all terms to the left:

3u+9-(30)=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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