42=-7z-(-21)

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Solution for 42=-7z-(-21) equation: 



42=-7z-(-21)

We move all terms to the left:

42-(-7z-(-21))=0



We calculate terms in parentheses: -(-7z-(-21)), so:

-7z-(-21)

We add all the numbers together, and all the variables

-7z+21

Back to the equation:

-(-7z+21)



We get rid of parentheses

7z-21+42=0

We add all the numbers together, and all the variables

7z+21=0

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

7z=-21

z=-21/7

z=-3

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