30=u-12

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Solution for 30=u-12 equation: 



30=u-12

We move all terms to the left:

30-(u-12)=0

We get rid of parentheses

-u+12+30=0

We add all the numbers together, and all the variables

-1u+42=0

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

-u=-42

u=-42/-1

u=+42

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