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 add all the numbers together, and all the variables

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



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

-7(+z*3)

We multiply parentheses

-21z

Back to the equation:

-(-21z)



We get rid of parentheses

21z+42=0

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

21z=-42

z=-42/21

z=-2

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