3(-3z+7)=-(3z+9)

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Solution for 3(-3z+7)=-(3z+9) equation: 



3(-3z+7)=-(3z+9)

We move all terms to the left:

3(-3z+7)-(-(3z+9))=0

We multiply parentheses

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



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

-(3z+9)

We get rid of parentheses

-3z-9

Back to the equation:

-(-3z-9)



We get rid of parentheses

-9z+3z+9+21=0

We add all the numbers together, and all the variables

-6z+30=0

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

-6z=-30

z=-30/-6

z=+5

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