-3u+21=-9(u+3)

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Solution for -3u+21=-9(u+3) equation: 



-3u+21=-9(u+3)

We move all terms to the left:

-3u+21-(-9(u+3))=0



We calculate terms in parentheses: -(-9(u+3)), so:

-9(u+3)

We multiply parentheses

-9u-27

Back to the equation:

-(-9u-27)



We get rid of parentheses

-3u+9u+27+21=0

We add all the numbers together, and all the variables

6u+48=0

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

6u=-48

u=-48/6

u=-8

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