-15=-9+3z

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Solution for -15=-9+3z equation: 



-15=-9+3z

We move all terms to the left:

-15-(-9+3z)=0

We add all the numbers together, and all the variables

-(3z-9)-15=0

We get rid of parentheses

-3z+9-15=0

We add all the numbers together, and all the variables

-3z-6=0

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

-3z=6

z=6/-3

z=-2

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