30=3u-9

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Solution for 30=3u-9 equation: 



30=3u-9

We move all terms to the left:

30-(3u-9)=0

We get rid of parentheses

-3u+9+30=0

We add all the numbers together, and all the variables

-3u+39=0

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

-3u=-39

u=-39/-3

u=+13

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