9=3u+6

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Solution for 9=3u+6 equation: 



9=3u+6

We move all terms to the left:

9-(3u+6)=0

We get rid of parentheses

-3u-6+9=0

We add all the numbers together, and all the variables

-3u+3=0

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

-3u=-3

u=-3/-3

u=1

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