54=3u+9

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Solution for 54=3u+9 equation: 



54=3u+9

We move all terms to the left:

54-(3u+9)=0

We get rid of parentheses

-3u-9+54=0

We add all the numbers together, and all the variables

-3u+45=0

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

-3u=-45

u=-45/-3

u=+15

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