42=-7(-7z-21)

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



42=-7(-7z-21)

We move all terms to the left:

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



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

-7(-7z-21)

We multiply parentheses

49z+147

Back to the equation:

-(49z+147)



We get rid of parentheses

-49z-147+42=0

We add all the numbers together, and all the variables

-49z-105=0

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

-49z=105

z=105/-49

z=-2+1/7

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