30=18+u

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Solution for 30=18+u equation: 



30=18+u

We move all terms to the left:

30-(18+u)=0

We add all the numbers together, and all the variables

-(u+18)+30=0

We get rid of parentheses

-u-18+30=0

We add all the numbers together, and all the variables

-1u+12=0

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

-u=-12

u=-12/-1

u=+12

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