30=3u-12

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Solution for 30=3u-12 equation: 



30=3u-12

We move all terms to the left:

30-(3u-12)=0

We get rid of parentheses

-3u+12+30=0

We add all the numbers together, and all the variables

-3u+42=0

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

-3u=-42

u=-42/-3

u=+14

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