-15=-5z-2z

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Solution for -15=-5z-2z equation: 



-15=-5z-2z

We move all terms to the left:

-15-(-5z-2z)=0

We add all the numbers together, and all the variables

-(-7z)-15=0

We get rid of parentheses

7z-15=0

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

7z=15

z=15/7

z=2+1/7

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