3u-9=6u+6

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



3u-9=6u+6

We move all terms to the left:

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

We get rid of parentheses

3u-6u-6-9=0

We add all the numbers together, and all the variables

-3u-15=0

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

-3u=15

u=15/-3

u=-5

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