315=-7z-8z

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Solution for 315=-7z-8z equation: 



315=-7z-8z

We move all terms to the left:

315-(-7z-8z)=0

We add all the numbers together, and all the variables

-(-15z)+315=0

We get rid of parentheses

15z+315=0

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

15z=-315

z=-315/15

z=-21

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