42=3u+12

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Solution for 42=3u+12 equation: 



42=3u+12

We move all terms to the left:

42-(3u+12)=0

We get rid of parentheses

-3u-12+42=0

We add all the numbers together, and all the variables

-3u+30=0

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

-3u=-30

u=-30/-3

u=+10

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