12=-3(-9-3z)

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Solution for 12=-3(-9-3z) equation: 



12=-3(-9-3z)

We move all terms to the left:

12-(-3(-9-3z))=0

We add all the numbers together, and all the variables

-(-3(-3z-9))+12=0



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

-3(-3z-9)

We multiply parentheses

9z+27

Back to the equation:

-(9z+27)



We get rid of parentheses

-9z-27+12=0

We add all the numbers together, and all the variables

-9z-15=0

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

-9z=15

z=15/-9

z=-1+2/3

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