3u-9=-3(u+1)

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Solution for 3u-9=-3(u+1) equation: 



3u-9=-3(u+1)

We move all terms to the left:

3u-9-(-3(u+1))=0



We calculate terms in parentheses: -(-3(u+1)), so:

-3(u+1)

We multiply parentheses

-3u-3

Back to the equation:

-(-3u-3)



We get rid of parentheses

3u+3u+3-9=0

We add all the numbers together, and all the variables

6u-6=0

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

6u=6

u=6/6

u=1

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