-84=-7(9+3z)

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Solution for -84=-7(9+3z) equation: 



-84=-7(9+3z)

We move all terms to the left:

-84-(-7(9+3z))=0

We add all the numbers together, and all the variables

-(-7(3z+9))-84=0



We calculate terms in parentheses: -(-7(3z+9)), so:

-7(3z+9)

We multiply parentheses

-21z-63

Back to the equation:

-(-21z-63)



We get rid of parentheses

21z+63-84=0

We add all the numbers together, and all the variables

21z-21=0

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

21z=21

z=21/21

z=1

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