30=-(5z+15)

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Solution for 30=-(5z+15) equation: 



30=-(5z+15)

We move all terms to the left:

30-(-(5z+15))=0



We calculate terms in parentheses: -(-(5z+15)), so:

-(5z+15)

We get rid of parentheses

-5z-15

Back to the equation:

-(-5z-15)



We get rid of parentheses

5z+15+30=0

We add all the numbers together, and all the variables

5z+45=0

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

5z=-45

z=-45/5

z=-9

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