-13=-z-(9z-7)

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Solution for -13=-z-(9z-7) equation: 



-13=-z-(9z-7)

We move all terms to the left:

-13-(-z-(9z-7))=0



We calculate terms in parentheses: -(-z-(9z-7)), so:

-z-(9z-7)

We add all the numbers together, and all the variables

-1z-(9z-7)

We get rid of parentheses

-1z-9z+7

We add all the numbers together, and all the variables

-10z+7

Back to the equation:

-(-10z+7)



We get rid of parentheses

10z-7-13=0

We add all the numbers together, and all the variables

10z-20=0

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

10z=20

z=20/10

z=2

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