42=3u+15

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Solution for 42=3u+15 equation: 



42=3u+15

We move all terms to the left:

42-(3u+15)=0

We get rid of parentheses

-3u-15+42=0

We add all the numbers together, and all the variables

-3u+27=0

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

-3u=-27

u=-27/-3

u=+9

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