6=-3(u+7)

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Solution for 6=-3(u+7) equation: 



6=-3(u+7)

We move all terms to the left:

6-(-3(u+7))=0



We calculate terms in parentheses: -(-3(u+7)), so:

-3(u+7)

We multiply parentheses

-3u-21

Back to the equation:

-(-3u-21)



We get rid of parentheses

3u+21+6=0

We add all the numbers together, and all the variables

3u+27=0

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

3u=-27

u=-27/3

u=-9

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