42=-2(z-3)

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Solution for 42=-2(z-3) equation: 



42=-2(z-3)

We move all terms to the left:

42-(-2(z-3))=0



We calculate terms in parentheses: -(-2(z-3)), so:

-2(z-3)

We multiply parentheses

-2z+6

Back to the equation:

-(-2z+6)



We get rid of parentheses

2z-6+42=0

We add all the numbers together, and all the variables

2z+36=0

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

2z=-36

z=-36/2

z=-18

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