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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-3(3x-9))+30=0



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

-3(3x-9)

We multiply parentheses

-9x+27

Back to the equation:

-(-9x+27)



We get rid of parentheses

9x-27+30=0

We add all the numbers together, and all the variables

9x+3=0

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

9x=-3

x=-3/9

x=-1/3

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