42=-7(z-3)=

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Solution for 42=-7(z-3)= equation: 



42=-7(z-3)=

We move all terms to the left:

42-(-7(z-3))=0



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

-7(z-3)

We multiply parentheses

-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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