42=3u-9

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Solution for 42=3u-9 equation: 



42=3u-9

We move all terms to the left:

42-(3u-9)=0

We get rid of parentheses

-3u+9+42=0

We add all the numbers together, and all the variables

-3u+51=0

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

-3u=-51

u=-51/-3

u=+17

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