3u+21=-9(u-1)

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Solution for 3u+21=-9(u-1) equation: 



3u+21=-9(u-1)

We move all terms to the left:

3u+21-(-9(u-1))=0



We calculate terms in parentheses: -(-9(u-1)), so:

-9(u-1)

We multiply parentheses

-9u+9

Back to the equation:

-(-9u+9)



We get rid of parentheses

3u+9u-9+21=0

We add all the numbers together, and all the variables

12u+12=0

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

12u=-12

u=-12/12

u=-1

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