3u-9u=30

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Solution for 3u-9u=30 equation: 



3u-9u=30

We move all terms to the left:

3u-9u-(30)=0

We add all the numbers together, and all the variables

-6u-30=0

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

-6u=30

u=30/-6

u=-5

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