9+6u=9u-3

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Solution for 9+6u=9u-3 equation: 



9+6u=9u-3

We move all terms to the left:

9+6u-(9u-3)=0

We get rid of parentheses

6u-9u+3+9=0

We add all the numbers together, and all the variables

-3u+12=0

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

-3u=-12

u=-12/-3

u=+4

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