3u=6u+9

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Solution for 3u=6u+9 equation: 



3u=6u+9

We move all terms to the left:

3u-(6u+9)=0

We get rid of parentheses

3u-6u-9=0

We add all the numbers together, and all the variables

-3u-9=0

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

-3u=9

u=9/-3

u=-3

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