12=-6u+3(u+7)

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Solution for 12=-6u+3(u+7) equation: 



12=-6u+3(u+7)

We move all terms to the left:

12-(-6u+3(u+7))=0



We calculate terms in parentheses: -(-6u+3(u+7)), so:

-6u+3(u+7)

We multiply parentheses

-6u+3u+21

We add all the numbers together, and all the variables

-3u+21

Back to the equation:

-(-3u+21)



We get rid of parentheses

3u-21+12=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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