30=12-9u

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Solution for 30=12-9u equation: 



30=12-9u

We move all terms to the left:

30-(12-9u)=0

We add all the numbers together, and all the variables

-(-9u+12)+30=0

We get rid of parentheses

9u-12+30=0

We add all the numbers together, and all the variables

9u+18=0

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

9u=-18

u=-18/9

u=-2

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